PLEASE HELP! 1. Describe two ways in which a cell grows.
2. What is inside the nucleus of a cell and what is
its purpose.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

trachea, alveoli, lung capillaries, arteries