The most parsimonious inference about the evolution of parental care behavior in crocodilians and
birds is
a. it evolved once in the common ancestor of
the two groups.
d. it is a learned behavior.
b. the derived character state is an
apomorphy.
e. parental care arose due to coevolution.
c. it evolved numerous times within each
lineage.
A
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The embryonic precursor to the human spinal cord is the _____
A) notochord B) neural tube C) mesoderm D) archenteron E) set of bilateral somites
Which of the following does NOT influence the pH of the blood and extracellular fluids?
a. respiration b. blood proteins c. bicarbonate ions d. filtration by glomerulus e. phosphate and ammonia ions
A karyotype shows chromosomes arranged by
a. color, width, and length. b. shape, size, and complexity. c. banding patterns, size, and shape. d. length, structure, and color. e. complexity, radius, and length.
Structurally, a sarcomere is
A) the region between two thick filaments. B) the region between two Z lines. C) an array of Z units. D) the region between a thick filament and the next thin filament.