7. In a desert such as this, what is the limiting
factor on plant populations? What would make
the population increase? What would make the
population decrease?

Water/H20

Explanation:

Plant's need energy and that energy that plants use is water in deserts it only rains about once a year depending where you are

phosphorus cycle

explanation:

the phosphorus cycle is the way that compounds of the element phosphorus, an essential nutrient, are recycled in the environment. plants absorb phosphorus compounds from the soil, and decaying organic matter, including both plant matter and animal droppings, returns it to the soil. phosphorus is a vital part of atp, the energy currency of all cells, and is vital to all forms of life.