What are desirable characteristics for a gas exchange surface, such as the endothelial cells lining the inside of lung? Select all correct choices

A. a large surface area
B. a small surface area
C. a thickness of 100 micrometers
D. a thickness under 10 micrometers


A,D

Biology & Microbiology

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The excretory structures of annelids are referred to as

A. flame cells. B. kidneys. C. protonephridia. D. metanephridia. E. malpighian tubules.

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Recessive traits are expressed only in the homozygous state. Indicate whether the statement is true or false

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Natural areas that are protected from human development are called ________

Fill in the blank(s) with correct word

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Hexokinase enzyme uses what metallic cofactor to transfer phosphate to glucose

a. iron b. nickle c. zinc d. magnesium d. manganese

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