Answer:
At the beginning of the follicular phase, the lining of the uterus (endometrium) is thick with fluids and nutrients designed to nourish an embryo. If no egg has been fertilized, estrogen and progesterone levels are low. As a result, the top layers of the endometrium are shed, and menstrual bleeding occurs.
there are not any options
Evolution, allowed birds to survive in various climates
Answer:
During the process of succession the successor develops first
Are exteroceptors and interoceptors.
