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

Example 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?
Example Output: fat

Example Input: The most common substance on earth, water, is primarily present in what state?
Example Output: liquid

Example Input: The rate of evaporation depends only on the surface area of the liquid and is essentially constant. the rate of condensation depends on the number of molecules in the vapor phase and increases steadily until it equals the rate of this?
Example Output:
evaporation