Answer: DNA
Explanation:
DNA also referred to as deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Almost every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus.
Answer:
The second one is correct
Explanation:
A leukocyte is responsible for the immune system
Answer:
not sure about the answer
A flatworm does not have a body cavity.
