D it’s the brain of the cell
Answer:
The answer is rocks.
Explanation:
Since the main source of phosphorus is found in rocks, the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering.
Answer:
Flatworms,crabs and starfish are classified as Invertebrates.This is due to the fact that they neither possess nor develop a vertebral column, derived from the notochord.