Review the image(s) and answer the following questions.

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1		Why is embryology a good indicator of evolution?
			A)	All embryos use the same genes at the exact same instant during development.
			B)	The embryos of various groups of vertebrates all share the same features of early development, suggesting an evolutionary relationship.
			C)	Embryological development occurs at the same pace in all organisms.
			D)	The fact that any organisms undergo embryological development at all suggests evolution.
2		The gill slits shown here in the human embryo suggest what common ancestor?
			A)	birds
			B)	algae
			C)	fish
			D)	mammals

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3		Punctuated equilibrium surmises that species formation occurs during bursts, followed by periods of relative quiet, while the notion of gradualism suggests speciation occurs continuously. Which theory is correct?
			A)	punctuated equilibrium
			B)	gradualism
			C)	both theories
			D)	neither theory
4		In what instances might punctuated equilibrium occur?
			A)	when the environment is changing rapidly
			B)	when the environment undergoes gradual change for a very long period
			C)	during hot periods
			D)	during cold periods

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5		Of the human skeletal traits shown in this diagram, which one is not related to walking upright?
			A)	spine S-shaped
			B)	skull attaches inferiorly
			C)	femur angled inward
			D)	None of these is correct.
6		In the course of human evolution, what uniquely human trait most likely evolved first?
			A)	one or two infants per pregnancy rather than a litter
			B)	infant nurturing
			C)	bipedal locomotion
			D)	large brain