Answer:
Research for species is done by microscopic view. The micro organism like fungi and bacteria are difficult to be observed by naked eye.
Explanation:
The research process includes the detailed view of the properties of micro organism. Their way of living separates them from each other. Parasites used to live in the body of their victim.
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Painful withdrawal symptoms can occur when a drug user attempts to stop using Drugs.