B bc deforestation is clearing of trees and plays no parts i pestcides :)
Answer:
In adults, the cord terminates at the level of L1-L2. Thus the cord spans within 20 bony vertebrae. In a child, it terminates at the upper border of L3. Each of these segments innervates a dermatome.
Explanation:
It measures the amounts of chemicals in certain substances
Difference between a primary and secondary barrier
primary barrier designed to protect against primary beam whereas secondary barrier designed to protect against secondary beam (scatter, leakage, stray, etc.)