A Type I survivorship curve is ___________
A. convex, such as that of humans
B. diagonal, such as that of lizards, small mammals, and large birds
C. concave, such as marine animals that release eggs
D. S-shaped, such as that of small birds
E. logarithmic, such as that of weeds
Answer: A
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Why is Caenorhabditis elegans an appropriate model organism for studying developmental processes?
A) C. elegans does not undergo programmed cell death B) C. elegans have meristems, regions that contain many stem cells C) C. elegans are transparent, and have only about 1000 cells, allowing the cells to be followed during development. D) C. elegans have millions of cells, but can be easily mutated to have no gastrulation. E) C. elegans have genes that are completely unique from mice and humans.
A pollen grain is best described as a ____
a. female spore b. female gametophyte c. male gametophyte d. male sporophyte e. female sporophyte
Aposematic, or warning coloration, serves to protect an animal or plant by signaling to potential ________ to stay away.
A. competitors B. predators C. mates D. rivals
Regarding the structure of DNA, the units that form the "uprights" (sides) of the DNA ladder and do not attach to the nitrogen bases are
A) deoxyribose molecules. B) phosphate molecules. C) sulfur-containing bases. D) ribose molecules.