Generating heat in order to start a reaction uses energy to begin with. Enzymes however reduce the activation energy and can only function (usually) within a narrow temperature range, using less energy. Enzymes are used because they are more efficient.
The prey will be confused by the appearance of a new animal, and it will not be sure if it's a predator or harmless animal. This usually causes the prey animals big problems because that confusion usually leads to their death. Also the defensive system that the prey has developed is made for the predators it knows, but is usually ineffective with the newly introduced predators.
Answer:
doesn't repopulate as fast
Explanation:
ecosystem 2 could have more trouble reproducing then ecosystem 1.
Answer:
A) respiratory system: gas exchange
Explanation:
The respiratory system's main function is to supply oxygen to all the parts of your body. It accomplishes this through breathing: inhaling oxygen-rich air and exhaling air filled with carbon dioxide, which is a waste gas
