Which of these structures is analogous in function to the tracheoles of insects?
A) Skin of an earthworm B) Body surface of a flatworm
C) Bronchi of a human D) Gills of a fish
C
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Scientists supporting phyletic gradualism explain any period of stasis in the fossil record as stabilizing
selection. ___________ Indicate whether the statement is true or false.
A homeowner uses a nail to hang a "Home Sweet Home" sign on the trunk of an oak tree. The sign is 2 meters above the ground. The tree grows in height at a rate of 10 cm per year. How high above the ground will the sign be in 15 years?
A) 1.5 meters B) 2 meters C) 3.5 meters D) 152 meters
In a certain ecosystem, caterpillars eat grass. Field mice eat the caterpillars and seeds from the grass. Snakes eat the mice. Hawks eat both the snakes and mice. Such an arrangement would be considered a(n)
Select one: a. food web. b. food chain. c. ecosystem. d. first trophic level. e. second trophic level.
Which hepatitis virus has a genome made up of double-stranded DNA?
A) hepatitis A B) hepatitis B C) hepatitis C D) hepatitis D E) hepatitis E