Question

Phosphorus is?

A.found freely in the atmosphere

B.returned to the soil by rhizoblum

C.added to the soil through weathering

D.usually very abundant in an ecosystem

Answer 1

D. ususally very abundant in an ecosystem

Step-by-step explanation:

Most commercial phosphorus is produced by mining and heating calcium phosphate. Phosphorus is the eleventh most abundant element in the Earth's crust