The evolution of the vertebrate skeleton system

A) originated from a snake-like animal with limbs.
B) enabled tetrapods to colonize land.
C) made animals significantly taller.


Answer: B

Biology & Microbiology

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A relationship between two species in which

both species benefit is known as

a. parasitism. b. mutualism c. competition. d. predation. e. commensalism.

Biology & Microbiology

In many ferns,

a. gametes are produced from meiosis. b. asexual reproduction occurs more frequently than sexual reproduction. c. fertilization is followed by formation of gametes. d. the gametophyte stage is completely dependent upon the sporophyte stage. e. more than one of these is true

Biology & Microbiology

Which event represents the process of releasing chemical mediators?

A. Binding of IgE by the Fc region to mast cells and basophils B. Binding of allergen to adjacent IgE binding sites on mast cells and basophils C. Histamine acting on smooth muscle D. Degranulation E. Prostaglandins causing vasodilation and increased vascular permeability

Biology & Microbiology

The maintenance of a constant internal environment in an organism is called _____.

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

Biology & Microbiology