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.
Explanation:
Answer:It is a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules into adenosine triphoshate and can release waste products.
Explanation:
Answer:
Global warming
Extra carbon dioxide in the atmosphere will increases the greenhouse effect. More thermal energy is trapped by the atmosphere, causing the planet to become warmer than it would be naturally. That increases the Earth's temperature which is also called Global Warming
Answer:
i'm pretty sure it's the endoplasmic reticulum
Explanation:
The answer is variation, because the same species can vary in color and sizes
