Answer:
estrogen
Explanation:
Estrogen, also known as estrogen, is a female sex hormone produced by the ovaries and released in the first phase of the menstrual cycle. It is the estrogen that confers all the female characteristics of women, such as breast size, texture and skin brightness, and is responsible for controlling ovulation and preparation of the uterus for reproduction.
<span>"To increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mothers." is selective breeding because they selectively chose which cows to breed.
</span>
Cell membrane is made up of Lipid Bilayer which are fluid in nature , means they move continuosly , due to this fluid nature they are selectively permeable to compounds.