Answer;
-Floodplain
The flat area on either side of a stream's natural levee, where alluvium is deposited, is called the foodplain.
Explanation;
-A floodplain is the area around a river that is covered in times of flood. A floodplain is a very fertile area due to the rich alluvium deposited by floodwaters.
-This makes floodplains a good place for agriculture. A build up of alluvium on the banks of a river can create levees, which raise the river bank. They are low-lying lands next to rivers, streams, and oceans. A floodplain is any land area susceptible to being inundated by water from any source.
Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into ammonia (NH3) or other molecules available to living organisms. The answer would be C.
Mutagen is an environmental agent that changes the DNA.
B. I think thats right :/
Simple diffusion and facilitated diffusion both allow molecules to cross the cell membrane without any expenditure of energy by the cell. They are each classified as a type of passive transport.