In the female body, each egg is surrounded by a which breaks open when the egg is mature.
a. ovary
c. placenta
b. follicle
d. uterus

The correct answer is the ovarian follicle. In the female body, each egg is surrounded by an ovarian follicle which breaks open when the egg is mature. The ovarian follicle is the one responsible in secreting hormone during the menstrual cycle. 

Giga is the second highest prefix on the normal scale, the first is terra.

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.