Answer:
the composition of a population gene can change over time through evolution
Explanation:
Nature selects
Answer:
2nd answer
Explanation:
potential energy is stored energy
Answer:
Explanation:
You need the respiratory system when you kick a ball because you need to be able to breath but if you are playing soccer this benefits the cardiovascular fitness level. Cardiovascular fitness is, according to the American Sports Medicine Institute, the efficiency of your heart, lungs and vascular system to deliver oxygen to your muscles to maintain activity.
Enzymes in a reaction act as catalysts. They speed up the chemical reaction process.
