Food and water supply,habitat space, and competition with other species
Answer:
new species often appear at about the same time.
Explanation:
A biotic crisis or a mass extinction crisis is a rapid and widespread decrease in biodiversity. There is a clear change after the mass extinction, in the diversity and of multicellular organisms.
The adrenal glands respond to stress by secreting Epinephrine, and Norepinephrine. Epinephrine causes the blood vessels to narrow, and it also opens up airways in the lungs. Norepinephrine increases the heart rate and blood pressure, and it also causes the energy stores to release glucose.
<span> <em>It would be </em>Blood Circulation.</span>
