Answer:
The cell membrane
Explanation:
The Cell membrane protects the cell and lets and lets out certain things.
Answer:
DNA (deoxyribose nucleic acid)
Explanation:
All viruses contain nucleic acid, either DNA or RNA, but not both, and a protein coat, which encases the nucleic acid. Some viruses are also enclosed by an envelope of fat and protein molecules. In its invective form, outside the cell, a virus particle is called a virion.
Answer: A wave
Explanation: Waves move in that kind of up and down motion, a circuit is a straight line with energy flowing through it, a magnet is a pulling effect and a prism is a shape, not necessarily a motion.
Hope this helps ^_^
"Water quality" may include the amounts of dissolved oxygen
and the levels of algal growth, pollutants which may be present and the pH level. Water quality effects also which types of organisms can
survive in a body of water.
Shellfish require a high level
of dissolved oxygen and their abundance is an indication of good water quality. Shellfish are sensitive to changes in the ecosystem and they cannot easily escape changes in the water quality. These are one of the reasons why shellfish are good indicators of water quality.
