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.
Answer:
A disease that is not contagious is called a noninfectious disease. These diseases are not caused by pathogens. Instead, they are likely to have causes such as lifestyle factors, environmental toxins, or gene mutations. Common types of noninfectious diseases include cancer, diabetes, and immune system diseases.
zain...insta...are youyou naina..
Answer:
capture
giant impact hypothesis
electromagnetic spectrum
cold
14
The moon's mass is much lower than the earth's; therefore, its gravity isn't strong enough to hold an atmosphere. This lack of an atmosphere and the moon's small size allowed it to become cool enough to the point at which it completely solidified. Thus, the moon doesn't have any plate tectonic activity.
Explanation:
Answer:
Positive - give pleasure to the watcher
Negative - uses time the watcher could've spent doing something else, the watcher can never get that time back again.
Explanation:
Positive - give pleasure to the watcher
Negative - uses time the watcher could've spent doing something else, the watcher can never get that time back again.
b)1 unicellular- means one cell
