Biology

The correct answer is: D.Rocks.

The original and primary reservoir of inorganic phosphate (PO₄³⁻) in terrestrial ecosystems is rocks. Phosphate exists in rocks, primarily in the form of minerals like apatite. Through a process called weathering, these rocks slowly release phosphate ions into the soil and water, making them available for plants and other organisms.

Here's a breakdown of the options:

A.Live plants and animals: While plants and animals do contain phosphate, they are not the primary source of inorganic phosphate. They rely on phosphate that is released fr...