Answer: the resilience of the pond ecosystem to different types of changes
Explanation:
The first answer is D. The padded webbing on their feet works much like a flipper would and helps them to move faster, by allowing them to move more water.
The second is B. Like pine trees most desert plants have spines so that they can retain as much water as possible.
The third is A. Not only are they sharp, but the way in which the jagged edges on their teeth lines up allows them to interlock to keep their prey from getting away.
Considering the following;
I. Heat is not readily available to all living cells.
II. Heat at excessive amounts denatures proteins.
III. Heat does not provide the activation energy for their reactions.
IV. When a critical temperature is reached, proteins no longer function
Answer;
I and IV
Explanation;
Living cells cannot use heat to provide the activation energy for biochemical reactions because heat is not readily available to all living cells and also when a critical temperature is reached, proteins no longer function.
Too much heat can kill an organism by rendering its organelles, cells, tissues and organs permanently inoperable and un-salvageable. The same process can be observed in tissues at low temperatures, and is the cause of frostbite. This is because enzymes are denatured by high temperature and inactivated by low.