Answer:
Are usually present, but are no longer functional.
Explanation:
Vestigial structures are "evolutionary remnants". They are anatomical features that were once important throughout the organism's evolution, but now have no function. However, they aren't harmful either, so there has been no selective pressure for them to be removed via evolution.
Good examples in humans are the tail bone, wisdom teeth, and the appendix.
Which of the following is not an extinct species?
A. Dodo
b. Bison
C. Sikkim stag
D. None of these
Answer: The answer is Bison
Answer:
Option B and C
Explanation:
Sikkim Stag is an endangered species
some species of the Bison are extinct
Who was affected with mercury poisoning ?
people who take in to much Mercury then get mercury poisoning
which three terms relate to sexual reproduction but not asexual reproduction
A mitosis
B gametes
C sperm
D meiosis
Answer:
gametes, sperm and meiosis
Answer:
b, c , and d
Explanation:
Which is the correct order of the levels of organization in plants and animals?
Answer:
The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
Explanation:
earth can support the survival of organisms.what is/are the factory/s that make/s earth habitable?
Answer:
The factors that make Earth support the survival of organisms are it's correct distance from the sun, the Earth is protected by solar radiation by it's magnetic field, stability of it's warm atmosphere, availability of some chemical composition that support life like oxygen, water, nitrogen e.t.c., proximity of the sun in allowing the passage and flow of water, the shape and size of the Earth as Rocky planet e.t.c.
Explanation:
Earth is the planets that support the survival of living organisms and this is because of the following factors that support the existence of life and these factors includeit's correct distance from the sun, the Earth is protected by solar radiation by it's magnetic field, stability of it's warm atmosphere, availability of some chemical composition that support life like oxygen, water, nitrogen e.t.c., proximity of the sun in allowing the passage and flow of water, the shape and size of the Earth as Rocky planet e.t.c.
It's correct distance from the sun makes it's to have stable temperature i.e not to hot and not too cold. With the temperature, living organisms can survive and live.
Earth is protected from solar radiation by ozone layer and it's magnetic field. This layer hinders the penetrations of some harmful Ray's it radiations that can damage it destroy living organisms.
It's allow water flow and water is essential for life . It is useful for plants for growth , photosynthesis and germination. Water is essential for animals because, it's aids digestion and metabolic processes.
Earth's atmosphere have right composition of chemicals that support life and these chemicals include oxygen, nitrogen, carbon, water e.t.c.
For example oxygen is important for respiration which releases energy to perform cellular activities.
An engineer made a model of a ship to help him think about how it works ha made sure that some characteristics of the ship were accurately represented but he did not include all of the ships characteristics in his model is it okay that he ignored some of the ships characteristics
Answer:
Yes it is ok
Explanation:
This usually depends on what the engineer is trying to accomplish or learn. For example, if the engineer is simply trying to understand how the architecture floats or cuts through the water then he does not need to model the engines or other unnecessary characteristics. On the other hand, if the engineer wants to understand how the engine provides power to the entire ship then he would need to model the engine and all the connected parts but not the outer exterior of the ship. Therefore, it is ok that he did not model the ship completely as long as it provides the information needed.
Water makes up a large percentage of the body’s cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from an area of high water concentration to an area of low water concentration is
A.Diffsion
B.stable transport
C.Active transport
D.Osmosis
Answer:
osmosis
Explanation:
on edge2020
The movement of water from an area of high water concentration to an area of low water concentration is called as Osmosis. Thus option D is correct.
What is osmosis ?The process in which solvent molecules pass from a lower concentration based solution to a higher concentration solution through a semipermeable membrane called as osmosis.
It is a passive process as no external energy is needed.
When a living plant cell kept in a sugar or salt solution, water diffuses from the cell sap out through the cell membrane called as ex-osmosis.
The cell causes shrinkage of the protoplasm due to water loss, where the cell undergo a condition called as plasmolysis or necrosis.
When the plasmolysed cell is placed in distilled water, the cell regains it’s turgidity and also the original shape and size by a process called endosmosis.
This condition is called deplasmolysis or cytolysis. Thus option D is correct.
Learn more about osmosis, here:
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What is substance in science?
Answer: A substance is matter which has a specific composition and specific properties. Every pure element is a substance. Every pure compound is a substance. Examples of substances: Iron is an element and hence is also a substance.
Explanation:
sub·stance
a particular kind of matter with uniform properties.
"a steel tube coated with a waxy substance"
Similar:
material
matter
stuff
medium
Which cell has both a cell wall and a cell membrane?
please answer quickly its urgent
Answer:
Plant Cell
contains both
Erwin Chargaff is considered one of the pioneering scientists in the field of molecular biology. In one of his studies, Chargaff observed that a sample of human DNA contained approximately 30% adenine (A). Based on DNA structure, what are the expected percentages of the other nitrogenous bases in the sample?
A.
10% thymine, 40% cytosine
B.
20% thymine, 30% cytosine
C.
30% thymine, 20% cytosine
D.
40% thymine, 10% cytosine#
Answer:
30% thymine, 20% cytosine
Explanation:
In a typical DNA double helix pyrimidine; Cytosine and thymine always pair with Purine ;Adenine and Guanine. This pairing ensure that the double helix of DNA is maintained by the presence of Hydrogen between these organic bases.
For correct pairing all adenine must pair with thymine,and all Cytosine with guanine.Therefore for this to occur if 30 % of adenine is present,the composition and number of thymine(30%) must be available.If this percentage is not available the pairing will not occur.
Like wise 20% Cytosine must be present because ,then same amount of Guanine molecule 20% in the DNA molecule. must be present Thus Guanine percentage is 20%.
This give a total of 100(60+40)
This based on the Erwin Chargaff stoichiometric ratio of 1:1 .This states that the percentage of adenine =thymine,and that of Guanine=Cytosine,in the DNA of living cells should be equal. Thus; [A]+[G]=[C]+[T]=1:1
What is a benefit to computational thinking
Answer:
It's not all about computer science
Explanation:
Which of the following is a molecule when broken down to a simple particle?
O gold
O nitrogen
O water
O francium
What happens in a chemical reaction? A. Substances change in appearance but do not in chemical composition. B. Substances change from solid to liquid or gas. C. Substances interact to form one or more new substances. D. New atoms are created or destroyed. Other:
Answer:
Choice C
Explanation:
Chemical reaction is basically when one or multiple substances would form into one or more new substances.
How do the molecular formulas for all the amino acids differ?
The molecular formulas for all the amino acids differ - the R group or side chain.
Each amino acid has the same molecular structure with a central carbon atom, the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.
Each amino acid is exactly the same except for the R group. little side chain represented by the will be different depending on the kind of amino acid.For example, glycine has a hydrogen atom as its R group, whereas alanine has a methyl group (CH3).Thus, the molecular formulas for all the amino acids differ - the R group or side chain.
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A group of parts that work together is callede. A. Technology.
B. process
C. system
D. feedback help me please
Answer:
C i think
Explanation:
Which health issue can be caused directly by a mutation resulting in a continuously growing and dividing cell?
is trypsin coagulates
the milk protein
Answer:
Trypsin coagulates the milk protein casein.
Which organelles work together to provide a plant cell with structure and
support?
A
the cell wall and large central vacuole
B. the cytoskeleton and cell membrane
C
the cytoskeleton and nucleus
D
the cell wall and chloroplasts
OU
Answer:
d the cell wall and chloroplasts
Explanation:
help me please asap??? :$
Answer:
A. To make more body cells. like skin cells or liver cells for example.
What process allows Na+ and K+ to move in and out of the cell simultaneously?
ANSWERS:
A.Simple Diffusion
B.Facilitated Diffusion
C.Active Transport
D.Osmosis
Answer:
The correct answer is: C. Active Transport.
Explanation:
Because Na+ and K+ are ions, which makes them charged molecules, they can only diffuse through the cell membrane when using specialized protein channels. This is called facilitated diffusion and is a form of passive transport because sodium and potassium move following their gradients, which are made of the difference in concentration between the inside of the cell and the outside of the cell. For example, potassium is highly concentrated inside the cell and poorly concentrated outside the cell, so potassium diffuses from the inside to the outside to even the concentrations.
But the question asks in which process Na+ and K+ move in and out of the cell SIMULTANEOUSLY, so the answer is actually active transport. Active transport is the opposite of passive transport. While passive transport occurs naturally and doesn't need ATP (energy) to happen, active transport needs ATP because it moves molecules AGAINST their gradient. One of the most famous and important structures involved in active transport is the Na+/K+ pump, which consists of a specialized protein using energy to enter 2 potassium ions and take out 3 sodium ions at the same time. This Na+/K+ is fundamental to maintain the gradients, which are important for the correct functioning of many cells.
which of the following will dissolve in water
a.oil
b.salt
c.alcohol
d.sand
Answer:
Salt will dissolve in water
Answer:
salt will dissolve
Explanation:
so if you put salt in water you notice the water changeing and its desloving just like how laxatives work like if you put powder in and stir and lay it down for couple mins it's clear and dissolved
Where is carbon located on our planet, and how are these carbon reservoirs different from each other?
Answer: Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms. These are the reservoirs, or sinks, through which carbon cycles. The ocean is a giant carbon sink that absorbs carbon.
1. Which of the following is not caused by deforestation?
A. Climate change
B. Desertification
C. Global warming
D. None of the
based on the information in the table, which type of oil is the worst for a healthy lifestyle
Answer:
coconut oil
Explanation:
Would the construction of this master-planned community impact the carrying capacity of the state’s ecosystem?
Answer:
Are you against or with?
Explanation:
,.;1q23wt4y5eu6ri7ertyur
what is the relationship between heart rate & respiratory rate (impact on oxygen, carbon dioxide & energy levels)
Which structures do ALL cells have in common
Answer:
a plasma membrane, cytoplasm, DNA, and ribosomes
Explanation:
hope this helps
Answer:
The cell structures that are common to all cells include the DNA or the genetic material; the cytoplasm, which is the fluid where the organelles are suspended in it; plasma membrane, also referred to as the cell membrane that serves as the cell's barrier to the external environment; and the ribosomes, which are the organelles in charge of producing proteins
Explanation:
Which sequence shows a decreasing level of complexity?
a. Organs -> organism -> cells -> tissues
b. Organism -> cells -> organs -> tissues
c. Cells -> tissues -> organs -> organism
d. Organism -> organs -> tissues -> cells
Answer:
D organism, organs, tissues, cells
Deforestation causes an increase in the atmospheric concentration of which greenhouse gas?
A fluorine
B methane
C nitrous oxide
D carbon dioxide
Answer:
i think its carbon dioxide.but not sure
Explanation:
remembering from like 3 months ago
Answer:
D. Carbon Dioxide
Explanation:
It is D. because trees absorb carbon dioxide and release oxygen into the air. So with out the tree's the Carbon Dioxide levels increase because there is nothing to absorb it.
can i have a brainliest?
Collisions between molecules cause diffusion.
True or false
If false then what does cause diffusion
Answer:
True
Explanation:
The collisions between the particles cause them to spread out and move away from each other.
