Which element is so reactive it is found in nature only in compounds?
Group of answer choices

Na (sodium)

Au (gold)

O (oxygen)

Fe (iron)

Answers

Answer 1
Na (sodium), because alkali metals are not found freely in nature due to their high reactivity. (In this group are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).

Related Questions

What are the biological implications of the structure of the plasma membrane (how do your results about the fluid mosaic and findings relate to life and death in the ‘real’ world? Where could the materials you worked with be found affecting the real world?)

Answers

Answer:

Structure of Plasma Membranes

The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.

Explanation:

What is found between stars that looks like smoke?

Answers

Answer:

gases of nitrogen and many more

Cosmic dust consists of tiny particles of solid material floating around in the space between the stars. ... It is not the same as the dust you find in your house but more like smoke with small particles varying from collections of just a few molecules to grains of 0.1 mm in size.

Which of the following statements about viruses is true?
A: A virus belongs to the Archaea Domain.
B: A virus is a single-celled organism.
C: A virus has a cell membrane made of proteins.
D: A virus can evolve.

Answers

Answer:

D: A virus can evolve.

Explanation:

Viruses are not organisms so that rules out all other options.

Dirty or harmful substances in the environment?

Answers

Answer:

pollution

Explanation:

Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories.

Hope it helps!

what information is copied from DNA to mRNA​

Answers

Answer: transaction

Explanation:

Answer:

Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA). DNA safely and stably stores genetic material in the nuclei of cells as a reference, or template.

Explanation:

PLEASE MARK ME AS BRAINLIEST

Draw a line representing the rise and a line Representing the run of the line. state the slope of the line in simplest form

Answers

Im not really sure if you’re looking for the slope-intercept but here it is lol. y = 2/1x + 2

why do you think using a person's own cell to make a new organ or tissue for them will increase the chance that their body will accept the transplant?

Answers

Answer:

In my personal opinion, I think this is possible because your body already knows the cell. It is already familiar with it.

Explanation:

There is balance between Apoptosis and Mitosis. What is the
characteristic of life that would involve maintaining this balance?
Metabolism
Respond to Stimuli
Homeostasis
Universal Genetic Code

Answers

Answer:

Homeostasis

Explanation:

PLEASE HELP WILL MARK THE BEST!!!!

Answers

Answer:

#3#5#7

Explanation:

hopes this helps

Explain the difference between the effects of balanced and unbalanced forces on an object. To receive full credit you must mention net force and whether the motion will change or not.

PLEASE HURRY WILL GIVE BRAINLIEST!!!

Answers

Answer:

balanced forces dont result in a change of motion. Unbalanced forces always result in a change of motion

if the forces applied are different amounts of newton's it causes an unbalanced force changing motion or even direction

how are indicator species used to assess pollution levels in the environment?

Answers

Answer:

By monitoring changes in the population of a specific indicator species, scientists may draw conclusions about changes in a specific pollutant's levels. In addition, this method of pollution measurement demonstrates the impact of pollution on vulnerable species.

Explanation:

Help with this plz
Thanks. :)

Answers

If a mutation results in an organism with new characteristics then eventually a new species will be formed if more such mutations will continue to accumulate in the individual. Mutations result into the accumulation of variations in an individual and when such variations keep on accumulating in a particular organism consistently it leads to formation of a new species or we can say that evolution has occured.

A mutation is a random change in DNA which therefore affects a gene and/or chromosome. Most mutations have no effect on the phenotype. Some influence phenotype to some extent. Very few create a new phenotype. Mutations can be inherited and therefore passed on from one individual to another. If a mutation causes a new phenotype that makes an organisms better suited to a particular environment, it can lead to rapid change in the characteristics of the individuals in that species.

Hope this helps

what is site of gaseous exchange in an insect​

Answers

Answer:

what are the answers? if I knew the answers I could tell ya

Which factor is needed for both thunderstorms and hurricanes to form?

Answers

Answer:

C. rising moist air

Explanation:

for the storm to start/process it needs the moist air in order for both hurricanes and thunderstorms to happen, because the rotation with the moistness creates the storms.

Hope this helps

Answer:

rising, moist air

Explanation:

because it is i got it right on my test

When we talk about soil depletion, which soil horizon are we talking about? Thank you

Answers

Answer:

Surface Horizon (A)

Nutrient depletion of soils is a widespread soil degradation phenomenon that occurs as a consequence of soil erosion (it is the topsoil in which generally most soil nutrients are present that erodes fastest) but also because of poor management practices, such as slash and burn and other subsistence agricultural.

What is the process called when two glucose molecules bond together to form a
disaccharide and why is it important.

Answers

Answer:

Dehydration reaction (a condensation reaction)disaccharide will provide energy for chemical reactions in the body to take place.

Explanation:

The Condensation Reaction is an organic reaction in which two molecules combine to give a single product accompanied by the formation of a molecule of water H2O. Disaccharides are produced when two monosaccharides are chemically combined. The bond called O-glycosidic, is the bond by which monosaccharides join to form disaccharides or polysaccharides. In this type of bond, an OH group of an anomeric carbon of a monosaccharide reacts with an OH group of another monosaccharide, releasing a water molecule.The main function of disaccharides is to provide energy to the cells of the human body, or glycogen. This is achieved through enzymes that act in the synthesis of the disaccharide, extracting glucose. Among the main and best known enzymes that act in this process are insulin for sucrose, lactase for lactose, and trehalase for trehalose.

Why is it important to know the average mutation rate when using DNA comparisons to determine
how long ago lineages split?

Answers

Answer:

mutation rates can be used to design molecular clocks in order to estimate divergence times among species  

Explanation:

In evolutionary biology, the substitution rates (also known as mutation rates) are used for the development of 'molecular clocks' which allow estimating the divergence times among species or among taxonomic groups. Molecular clocks can be designed by estimating the divergence rate of nucleotide sequences (either DNA or RNA) and amino acid (protein) sequences. These substitution rates can also be used to track how quickly viruses evolve (for example, in a pandemic situation).

What does the prefix pseudo mean in the word pseudoscience?

false
subjective
systematic
factual

Answers

Hii!!! I believe the answer is A. False. (:

how does cell division help in growth and development of somatic cells and in gamete formation?

Answers

════════ ∘◦❁◦∘ ════════

[tex] \mathbb{CELL\:DIVISION\:(MITOSIS)} [/tex]

════════════════════

Well, im not sure what somatic cell is. But, the reason why cell division help in growth and development is because the main goal of cell division is to make more cells right? This is also why we keep growing (like taller/bigger) because more cells in our body because of that cell division.

#see pic of how cells in our body divide during mitosis

#sorry i borrow this ans for my latex experiment :v

════════════════════

Mitosis occurs in somatic cells this means that it takes place in all types of cells that are not involved in the production of gametes. Prior to each mitotic division, a copy of every chromosome is created; thus, following division, a complete set of chromosomes is found in the nucleus of each new cell.

Help me please really quick

Answers

Answer:

D. electromagnetic energy

Answer:

C

Explanation:

mixed together they make helium which would be chemical

Describe a grassland ecosystem briefly.​

Answers

A grassland is a biome, an area of land that mostly has grasses. There are wild grasses, and there may be some trees. Several parts of the world have grasslands. Grasslands are found in Africa, North America, Central Asia, South America, and near the coasts of Australia.

An area where the vegetation is dominated by grasses and other herbaceous (non-woody) plants, few to little or no trees.

Rearrange the steps of a tsunami formation in the correct order

1. two tectonic plates slide past each other underwater, causing a large movement of water

2. large ocean waves form

3. large ocean waves move in all directions away from the shifting plates

4. large ocean waves slow down and increase in height as they reach the coast

Answers

Answer:

two tectonic plates slide past each other underwater, causing a large movement of water large ocean waves form .large ocean waves move in all directions away from the shifting plates .large ocean waves slow down and increase in height as they reach the coast

Explanation:

Tsunamis are initiated underwater and usually happen as a result of underwater earthquakes which can be initiated when tectonic plates slide past each other.

This causes a large movement of water such that large waves form and move away in al directions from the source. As these waves approach the shore they slow down speed but this only increases their height such that when they make landfall the effect could be devastating.

How could physical barriers, such as a river or rift, lead to allopatric speciation

Answers

Answer:

This barrier prevents the individuals on one side from reproducing with the individuals on the other.

Explanation:

Hope this helps

why man reproduce??​

Answers

Answer:

to pass off their offspring

Explanation:

i'm not sure  about what your asking  

Answer:

To pass of there offspring

A scientist compares two samples of white powder. One powder was present at the beginning of an experiment. The other powder was present at the end. She wants to determine whether a chemical reaction has occurred. She finds that neither sample bubbles or dissolves in water. She measures the mass and volume of the solids. Sample one has a volume of 45 cm3 and a mass of 0.5 g. Sample two has a volume of 65 cm3 and a mass of 1.3 g. What should the scientist conclude?

A.
The samples have the same color, so no chemical reaction has occurred.
B.
The two samples do not react with water, so no chemical reaction has occurred.
C.
The densities of the samples are different, so a chemical reaction has occurred.
D.
The densities of the samples are the same, so no chemical reaction has occurred.
E.
The densities of the samples are different, so no chemical reaction has occurred.

Answers

Answer:

I think it is C because there densities are different.

Which of these provides the best evidence that an environmental change has occurred?

Answers

Answer:

c

Explanation:

Marine fossils as their name say are should usually be in the ocean. not in a freshwater lake

Hope this helps

Yall Im struggling, if u cant read it, the question is “why does a mountain climber need an oxygen supply at very high altitudes, even tho the air still contains 21% oxygen?

Answers

Answer: Because it is harder to draw breath in. And the cold

Explanation: At higher altitudes, it becomes more dangerous, and you can develop altitude-related illnesses such as HAPE and HACE. I read a book called Into Thin Air, and in the book the author goes into detail on the details/complications of climbing Mt.Everest and oxygen needs. Mountain climbers use canisters of oxygen called Supplemental Oxygen.

What are 3 ways in which matter changes over time?


Please help me i have a science paper that has this question

Answers

solid , maltings , freezing

List the four steps of mitosis in order. Describe what is happening during each phase.

Answers

Answer:

The four stages of mitosis are known as prophase, metaphase, anaphase, telophase. Additionally, we'll mention three other intermediary stages (interphase, prometaphase, and cytokinesis) that play a role in mitosis. During the four phases of mitosis, nuclear division occurs in order for one cell to split into two.

Explanation:

Plants draw water out of the ground and release water vapor into the atmosphere.
What is this process known as?
Precipitation

Evaporation

Transpiration

Condensation​

Answers

The answer is transpiration

Answer:

D: Condensation​

Explanation:

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