2. The endoskeletons of most vertebrates are composed of calcified (A)cartilage. (B) enamel. (C)chitin. (D)dentin.

20. An advantage of asexual reproduction is that it(A) allows the species to endure long periods of unstable environmental conditions(B) enhances genetic variability in the species(C) enables the species to flourish in stable habitats that are favorable to that species(D) produces offspring that respond effectively to new pathogens(E) allows a species to easily rid itself of harmful mutations

2. The endoskeletons of most vertebrates are composed of calcified
(A)cartilage.
(B) enamel.
(C)chitin.
(D)dentin.

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