A. an open circulatory system
Explanation: In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel
The factories and the boats with oil they drop pollution
Answer:
B. It maintains homeostasis.
Explanation:
The cell membrane controls what enters and leaves the cell which maintains homeostasis.
Answer:
The correct answer will be option-C.
Explanation:
The Nucleic acids present in the cells are of two types: Ribonucleic acid (RNA) and the Deoxyribose nucleic acid (DNA).
These nucleic acids show distinctive differences in their structure like:
1. Sugar: The sugar in DNA lacks oxygen group at the 2' C which is present in the RNA as OH group is present.
2. Nitrogenous bases: The nitrogenous base in the DNA are adenine, guanine, cytosine and thymine whereas RNA lacks thymine and have uracil.
The main difference is the structure if sugar on the basis o which these nucleic acids have been named. Thus, Option-C is the correct answer.
