Which activities? I want to say the nucleus as it is the control center of the cell, but this is a vague question.
Cell divison is necessary to replace cells that are worn and aging. Cells do not have an indefinite life span. Fo example, the life span of a red blood cell is about 120 days.
Answer:
The 3 would be the following:
A
captive breeding of organisms
E
introduction of invasive species
restoration of degraded land
<span>The circulatory system is vital in the exchange of oxygen with the cells in the animal's body because there is no living creature that can survive without oxygen, it keeps the body active.
</span>♡♡Hope I helped!!! :)♡♡
