Humans have disrupted the nitrogen cycle primarily by
a. irrigation.
b. cutting down forests.
c. using nitrogen-containing fertilizers.
d. crop rotation.
e. leaching.
C
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Which statement about diversity in eye development is not correct?
A. Planaria have the simplest eyes, which are basically pit-shaped cells containing photoreceptors. B. Evolution of the spherical lens improved images as animals evolved. C. Both squids and vertebrates have singlelens eyes, but they are very different in their development, anatomy, and physiology. D. The percentage of living animals possessing true eyes that can produce an image is small. E. Compound eyes consist of hundreds of small lenses arranged on a convex surface.
An ommatidia is part of a:
A. single-lens eye. B. compound eye. C. eyecup. D. All of the answer options are correct.
Which feature is characteristic of all polysaccharides?
a. energy usage
b. always branched chains c. fructose subunits d. only consisting of carbon, hydrogen, and oxygen atoms e. produced by condensation reactions
What are phylogenetic trees?
What will be an ideal response?