Communities on hard substrate are often found distributed
a. randomly.
b. equally spaced out.
c. equally spaced along a vertical gradient.
d. in patches.
D
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The portion of the ear that allows for balance control
is indicated by a. A. b. B. c. C. d. E. e. nothing labeled on this figure.
Labor preceding birth _____.
A. is a positive feedback loop B. is a negative feedback loop C. is influenced by prolactin D. proceeds at a regular pace E. stabilizes hormonal balance
In the section "Investigating Life: Solar-Powered Sea Slugs", the sea slug Elysia chlorotica absorbs chloroplasts as it digests algae. This allows the sea slug to live on sunlight and carbon dioxide and suggests that
A. photosynthesis can occur from proteins released from a digested chloroplast. B. regions of a plant outside of the chloroplast are necessary for photosynthesis. C. chloroplasts alone are sufficient for photosynthesis. D. some of the algae are not digested and are living symbiotically inside of the sea slugs. E. photosynthesis can occur outside of a chloroplast in algae.
Which is incorrect about smallpox?
A. The poxvirus called variola is the etiological agent. B. The vaccine is effective even if given in the first few days after exposure. C. There is an effective vaccine. D. The last case was seen in 1977. E. Transmission is by ingesting contaminated water or food.