I would say C.
Dams don't use any chemical means to get their energy output, so B and D are out. A converts to potential energy which can't produce electricity without being set in motion, so it doesn't work. That leaves B, which makes sense. Potential energy to mechanical energy to electrical energy.
True, a lot of cultivated fields use fertilizers that can be harmful to fish
The answer is <span>c. One that is most easily affected by changes in water quality.
An indicator species is a biological species whose presence or absence and even abundance can indicate specific environmental conditions. For example, there are some species (plant, fish, invertebrates,...) that can live only in an extremely clean river. But, if that clean river gets polluted by human activity, the river will not be any long extremely clean, and sensitive species will not survive and will disappear from the river. Its absence will indicate that river quality is threatened.</span>
Answer:
B. are at the beginning of every food chain in a
community
make the environment suitable for complex plants
Answer:
The nature of the cell membrane is semi- permeable. This means that it allows some of the molecules or ions to pass through it but others cannot pass through it.
<em>The information in the question shows that the substance L moves inside the cell by passive transport. </em>As it moves through the help of large proteins we can say that these proteins are channel or carrier proteins.
We can say that the substance L is moving by passive transport because as the concentration of L increases outside the cell, the rate of its entry into the cell also increases i.e along the concentration gradient.