Answer:
Sperm-egg interaction
Explanation:
The formation of fertilization envelope is well-studied on the model system- sea urchin. It has been shown that, the fertilization envelope is formed after the initial sperm-egg interaction from the egg surface vitelline envelope and the paracrystalline protein fraction which is derived from cortical granules. Secretion from cortical granules, prevents polyspermy.
Anthropology and sociology
It is essential because without it plants would have no source of energy. Therefore disrupting the whole food chain.
A: white oak
b: cottonwood
c:american elm
d:silver maple
e:black willow
f:green oak
D) Robert Hooke first discovered cells when observing cork under the microscope.
