Oxygen because we need it to breath if that’s the wrong anwser sorry but it should be right
Answer:
Free-living flatworms ingest food
Explanation:
Natural selection could not occur without environment, and a act on animal.
The ability of muscle to shorten forcibly when adequately stimulated is known as <u>contractility.</u>
Explanation:
- Contractility is defined as the ability of muscle cells to contract forcefully to bring about movement in body organs.
- The folding of arms are results of contractility of biceps and triceps.
- Contractility of cardiac muscle to regulate pumping of heart is again a result of contractility of myocardial muscle.
Answer:
if anaerobic activity takes place over a long period of time the muscles soon become exhausted
