If PCBs escaped into the river in large amounts and entered the lower levels
of the food chain, what would be the likely outcome?
Answers
Answer:
Over time, PCBs would collect in top predators such as salmon, making them unsafe for human consumption.
Explanation:
PCBs last a long time in the environment before breaking down and may find their way into the food chain. Low levels of PCBs can be found in fish, shellfish, meat, poultry, milk, dairy products, and other foods. Since PCBs have not been made since 1977, the levels in the environment have been declining over the past several years. Predators at or near the top of the food chain (e.g. birds, fish) have the highest levels of PCBs in their bodies.
Related Questions
Which reason best explains why dead specimens must be used with transmission electron microscopes?
A.) Electrons pass over the specimen.
B.) The lights that are used are harmful to the specimens.
C.) Specimens are placed in a vacuum.
D.) The image that is produced is two dimensional.
Answers
Answer:
C. Specimens are placed in a vacuum
Answer:
C. Specimens are placed in a vacuum
Explanation:
Since transmission electron microscopes must be used in a vacuum the specimen cannot be living. In a vacuum, there is no oxygen so nothing could survive it.
Glucose is needed in every cell, but it cannot pass easily through the cell membrane. The hormone insulin
and ATP, an energy source for cells, help glucose get inside a cell. Since this process uses energy, which
process does this describe?
Answers
Answer:2
Explanation:
Refer to the illustration below. The photosynthetic algae are:
Please anybody!
Answers
Answer:
Producers
Explanation:
Photosynthetic organisms are producers.
what term refers to the horizontal layers of soil ___ is a vertical cross-section view of the different ___, which are parallel to the surface.
soil bands
soil horizons
soil layers
Answers
Answer:
soil horizons
Explanation:
Answer:
first slot: soil profile
second slot: soil horizons
Explanation:
for plato users :)
Which of the following comparisons is ACCURATE?
Carbohydrates and lipids contain the same elements in different ratios or
proportions.
Lipids and nucleic acids are both built from amino acids.
Proteins are built of nucleic acids and DNA is built of amino acids.
Saturated fats are another name for polysaccharides.
Answers
Answer:
4ygfhjvffhjvrjffhdhehr
Answer:
It's the first one. Carbohydrates and lipids contain the same elements in different ratios or proportions.
28. Which of the following is most likely to cause the greatest disruption to an ecosystem?
Answers
Answer:
Emptying an aquarium containing non-native species into a local waterway will most likely to cause the greatest disruption to an ecosystem. A non-native species can be invasive and may disturb the already living native species in the waterway.
Explanation:
Answer:
Emptying an aquarium containing non-native species into a local waterway
Explanation:
help!!! with thesees
Answers
Answer:
The first one
Explanation:
Plants take the enegry from the sun, to make food, but if the sun goes away tthe plants don't have a source to make food from.
how is the mode of a date set defined. it is the middle value of the set. it is the most common value in the set. it is the average of the different values in the set. i’d is there difference between the highest and lowest values of the set
Answers
Answer:it is the most common value in a set
Explanation: since we know to find the mode you group each number and count which one has the most
a
5. What happens on the floor when the force of your body pushing down as you stand on it?
a reaction to the floor pushing up
b. matched by the floor pushing up on your body
c. less than the reaction force applied by the floor
d greater than the reaction force applied by the floor
Answers
Answer:
my choice is B
Explanation:
matched by the floor pushing up on your body cuz technically the body has greater force applying on the floor so the floor reacts by pushing your body up
(not clear so thanks, sorry and hope I was helpful)
The lab setup shows four test tubes. Tube 1 contains water only. Tube 2 contains a live snail. Tube 3 contains a live green water plant. Tube 4 contains both a live green water plant and a live snail.
In this setup, which tubes contain at least one organism carrying on cellular respiration?
A) Tubes 1 and 2 only.
B) Tubes 2 and 4 only.
C) Tubes 3 and 4 only.
D) Tubes 2, 3, and 4 only.
Answers
Answer:
D
Explanation:
Please help I’m crying in frustration rn someone please write a sentence I could use
Answers
answer:
aw don't cry im so so sorry
explanation:
i got you okay
an organism that has 2 alleles that are different genes are called heterozygous & phenotypes associated with a certain allele sometimes are recessive or dominant, often there are not though.
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
Why do many desert plants have small leaves?
O Deserts are cold and small leaves help hold in heat
O Leaves that have a small surface area lose less water
OSmall leaves protect desert plants from pollution
OSmall leaves protect desert plants from animals that eat plants
Answers
small leaves protect desert plants from animals that eat plants.
Answer:
Small leaves protect desert plants from animals that eat plants
Explanation:
Small leaves protect desert plants from animals that eat plants
pls help pls pls pls
Answers
Answer:
All of them are correct
Explanation:
Becuase the mom have freckles and the dad does not so the kid has a 50/50 chance of having freckles
the genotype chart would give you these four combinations so all of these awnsers will be correct
The Big Bang Theory is an example of which kind of theory of creation of the
universe?
Expansion
Steady State
Unchanging
Moving
Answers
Which diagram correctly shows how heterozygous alleles are found on homologous chromosomes?
Answers
Answer:
The answer is I think D
Explanation:
The diagram that correctly shows how heterozygous alleles are found on homologous chromosomes is ; Aa ( The first diagram )
Heterozygous alleles are different alleles gotten/inherited from the genes inherited from each parent cells ( i.e. from each parent ). while
Homologous chromosome is a pair of chromosomes containing same gene sequence, chromosomal length and posses the same centromere location in each chromosome in the pair.
Hence we can conclude that The diagram that correctly show how heterozygous alleles are found on homologous chromosomes is the first diagram ( Aa ).
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Please. My teacher never explained this
Answers
Answer:
The answer is C) Commensalism
Explanation:
The reason is due to the fact that there is evidence in the paragraph describing the relation of two species. If you look in the last sentence of the paragraph, it says, "The relationship between 2 species that can be represented as +/0"
The symbol +/0 is actually saying/meaning one side is benefited while the other side is neutral or not benefited!
The picture shown bellow will help!
Commensalism = +/0 (One side is benefited while other isn't benefited or hurt)
Mutulaism = +/+ (Both sides benefit each other)
Parasitism = +/- (One side benefits while other is harmed)
What is the use of tail in human sperm?
Answers
It’s an adaptation that allows the sperm to travel to the egg more efficiently as the distance is long and most sperm do not make it to the egg so this increases the chance of fertilisation.
Explanation:
The cell membrane acts as a barrier between the cell and its environment. Which best describes the type of barrier that the cell membrane forms?
Answers
Answer:
B: Permiable but selective, like a wall with gates.
Explanation:
Which of the following is associated with infant mortality rates?
A Conflict, including war
B Cultural beliefs
C Hygiene and sanitation
D Religious beliefs
Answers
1. What is the parts of Earth and Earth's where there is life.
Answers
Answer:
The Earth's water—on the surface, in the ground, and in the air—makes up the hydrosphere. Since life exists on the ground, in the air, and in the water, the biosphere overlaps all these spheres.
Explanation:
How does water act as a buffer and why is it not a good one
Answers
H2O ⇌ H+ + OH-
lies on the far left.
therefore a container of water wouldn't have many H+ and OH- ions floating about.
There WOULD be a very very very small concentration and H+ and OH- in it, since a value of Ka means that it does ionise in itself, but on the whole there would be MORE water molecules floating about. This is why water acts as a very poor buffer.
You need the acid AND the conjugate base (salt) for a buffer to work.
HELLLLPPP PLEASEEEEE!!!!
Which is an organelle that performs photosynthesis and is paired with its correct function?
A) Chloroplast-converts light energy into chemical energy.
B) Chloroplast-converts chemical energy into light energy.
C) Mitochondrion-converts cellular energy into glucose chemical energy.
D) Mitochondrion-converts energy found in glucose into energy for cells.
Answers
Answer:
A
Explanation:
Plants absorb the light and turn it into chemical energy with the help of chloroplasts
Chloroplast is the organelle in the plant cell which converts light energy into chemical energy. Chloroplast performs photosynthesis. Thus, the correct option is A.
What is Chloroplast?A chloroplast is a type of membrane-bound organelle which is known as a plastid which conducts photosynthesis mostly in the plant cells and algal cells. Chloroplast are the organelles which convert the light energy into chemical energy in the form of carbohydrates (sugar). The photosynthetic pigment chlorophyll is present in the chloroplast which captures the energy from sunlight, converts it, and stores it in the energy-storage molecules such as ATP and NADPH while freeing up the oxygen molecule from water in the cells.
Chloroplast is the double membranous organelle which is present in the plant cells and certain algal cells. This organelle is absent in the animal cells. Thus, they cannot perform photosynthesis.
Therefore, the correct option is A.
Learn more about Chloroplast here:
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The variety of life within a particular habitat, often measured by
the number of different species is known as
Answers
Answer:
"Biodiversity" would be the appropriate response.
Explanation:
Biodiversity, sometimes referred to as biological diversity, is the spectrum of organisms occurring on Earth although, occasionally, the entire range of life on Earth. The accumulation of species through a region is a general indicator of this diversity, considered species prevalence. Throughout ecosystems, like something from an intricate network, almost all of these plants or animals helping to maintain equilibrium and sustain life.30 POINTS
The chart below shows the atomic numbers and mass numbers for two elements. Element 2 has a greater atomic number and mass number that element 1.
Element 1
Atomic number 26
Mass number 56
Element 2
Atomic number 31
Mass number 70
How many more neutrons does element 2 have than element 1?
5
14
9
39
Answers
Answer:
9
Explanation:
i took the hmh test
PLEASE HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
What variable is found on the Y-Axis on the HR diagram?
Answers
4a. Describe two examples of non-living things that have one or more of these characteristics of
life.
Answers
Answer:
Water and Air
Explanation:
Water and air both are missing cells that living things have.
What is the molecule depicted in the figure above and in which organelle would it most likely be created?
A. ATP, the mitochondria
B. ATP, the nucleus
C.ADP, the chloroplast
D. ADP, the ribosome
Answers
Answer:
The answer is A.
Explanation:
ATP, the mitochondria
The molecule depicted in the figure above is ATP and the cell organelle in which it would most likely be created is: the mitochondria.
Cell organelles can be defined as the internal organs that are typically responsible for the performance of various functions (tasks) within the body of a living organism such as an animal, plant, and humans, especially for the survival of the organism.
Some examples of cell organelles found in the body of living organisms include the following:
Nucleus. Cytoplasm. Cell membrane. Chromosome.Endoplasmic reticulum (ER). Golgi apparatus (bodies).Vesicles.Mitochondria.Mitochondria is commonly referred to as the "power house" of a cell because it is saddled with the responsibility of providing and transforming all of the energy required by living organisms in the form of adenosine triphosphate (ATP).
In conclusion, it is very important that energy (ATP) is provided by mitochondria for the survival and optimum performance of a living organism.
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PLEASE HELP URGENT QUESTION NEEDED ASAP PLEASE BIOLOGY
QUESTION:
Generate an argument about whether or not viruses should be considered living or nonliving. Use at least two pieces of data to back up your claim.
Answers
Answer:
viruses are non living when they are not in another living being
But when they get into a living being,the virus cell produces more of the virus cells and in the end the host cell explodes
viruses are non living when they are not in another living being is the correct answer
2 Label each of the diagrams below to show whether the seeds are spread by exploding pods, wind,
water or animals.
Answers
Answer:
b: pineapple
d: coconut
e: beans
Explanation:
I think they all form.Answer:
A. wind
B. animals
D. water
E. exploding pods
Explanation:
What processes on earth help with the rock cycle?
