13. Jane wants to figure out which of two foods is the healthiest for her pet gerbil, Bob, so she decides to conduct an experiment. She feeds Bob food A for two weeks and then measures how much Bob weighs. Then she switches the food to
gerbil food B for two weeks and measures how much Bob weighs. Throughout the experiment, she gives Bob the same
amount of water each day, and keeps the temperature in the room constant.
What is the independent variable in this experiment?

The type of food Bob is given.

Explanation:

An independent variable in an experiment is the variable that is changed. Here, the type of food is the only thing that is changed and the amount of water, temperature and other variables were kept constant (same). Thus, the independent variable is the type of food Bob is given.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.