Answer:
Systemic anatomy considers the structure of major <u>organ systems</u>, whereas surface anatomy refers to the study of <u>superficial markings</u>.
Explanation:
Systematic anatomy is the study of the different organ systems that work together to carry out complex functions, that is, this discipline allows the organism to be analyzed in sections or systems, based on the functions together that have several organs, describing in isolation each part that composes it.
Surface anatomy is the study of the external characteristics or surface of the body (superficial markings) relating the anatomical accidents of it, that is, it allows to visualize the existing relations between the anatomical structures and the anatomical surface marks, analyzing the surface of the body, relating the anatomical accidents that may be in it with the organs and internal body parts.
The statement is true. Dead zones are the zones of oxygen depletion, which is caused by excessive running off of the fertilizers into the water body. These chemicals, particularly the nitrates, which are used by algae etc. which bloom by using the nitrates and use the oxygen present in the water. When they die, oxygen levels become critically low till then, for other aquatic animals like fishes etc., to survive.
I think it is 40 percent, that is what fao(.org) says
