Which one of the following is not a function of carbohydrates (as a class)?
A. structural support
B. energy storage
C. energy source
D. enzymatic catalysis
E. All are carbohydrate functions.
Ans: D. enzymatic catalysis
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What is heterogeneity?
a. intra-species genetic variation b. similarity between species across habitats c. number of ecological niches d. endemic inbreeding
The primary organisms that make up the deep scattering layer are:
a. zooplankton and fishes. b. phytoplankton. c. seston. d. nanoplankton. e. marine snow animals.
Of the following, the most important cause of deforestation is ________
A) city expansion B) farming C) fires caused by lightening D) continental drift
The figure below illustrates that 
A. most animal species have eyes with one photoreceptor and one pigment cell. B. the retina and cornea developed first, but then were secondarily lost in insects such as Drosphilia. C. genetic changes in an ancestral Pax6 gene contributed to the evolution of the mammal eye, while the Drosphilia eye arose independently. D. eye complexity has not significantly increased since the late Triassic when most modern insect families arose. E. although the mammal eye possesses more cell types and greater complexity than the Drosphilia eye, both arose from genetic changes to an ancestral Pax6 gene.