Primary succession begins on rock formations, such as volcanoes or mountains, or in a place with no organisms or soil.
C.) Increased pollution in air, water, and soil.
By producing all the unnecessary things we are causing more pollution to be made by factories.
Answer:
d. blood moves from the heart into arteries and into smaller vessels and then back into larger vessels as it makes its way back to the heart.
Explanation:
A closed circulatory system is a system in which blood is separated from the interstitial fluid as it circulates in the blood vessels. In a closed circulatory system blood circulates in one direction that is from the heart and then then returns to the heart again after circulating around one of two routes of circulation. A closed circulatory system can be observed in vertebrates, annelids, mollusks.
The name of the polysaccharide which is made in plants is Starch.
