Pls help All cells from an individual have the genes but they are expressed differently

You can turn on and turn off to make different proteins.
genes are active at different times in your life
Gene expression allows cells to

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?