In a comparison of birds and mammals, having four limbs is _____

A) a shared ancestral character
B) a shared derived character
C) a character useful for distinguishing birds from mammals
D) an example of analogy rather than homology


Answer: A) a shared ancestral character

Biology & Microbiology

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Bacteria that do not have a fixed shape are said to be ________.

Fill in the blank(s) with the appropriate word(s).

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Match each type of muscle with the correct description of its structure.

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Where is partial pressure of CO2 the highest?

a. atmosphere b. skeletal muscle c. capillary bed in alveolus d. alveolus (lung air sac)

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Cold is preferred for storing food because it retards microbial growth by slowing down metabolic processes.

Answer the following statement true (T) or false (F)

Biology & Microbiology