Given a scientific question, generate a correct answer to it.

Ex Input:
Two kinds of sex hormones are of particular importance in females: progesterone, which prepares the uterus for pregnancy and prevents the further release of eggs from the ovaries during pregnancy, and the estrogens, which are mainly responsible for the development of female secondary sexual characteristics, such as breast development and increased deposition of this?

Ex Output:
fat

Ex Input:
The protist life cycle benefits by including what forms of reproduction?

Ex Output:
asexual and sexual

Ex Input:
Most air masses form over what two types of regions?

Ex Output:
polar and tropical