An ecosystem
a. includes populations but not habitats.
b. is the same as a community.
c. consists of a community and the physical and chemical environment.
d. is none of the above.
a
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At pH 11, a peptide with the sequence G-M-G-V-S-D-P-D-A has the net charge of:
A. -3 B. -2 C. -1 D. +1 E. +2
Which population is more likely to be affected by genetic drift?
a. 12 squirrels in a forest b. 49 herons in a colony c. 215 fleas on a dog d. 1350 mice in a house e. 3000 zebra in a herd
Body parts that are similar in different lineages because the lineages have a common ancestor are ____
a. homologous structures b. comparative structures c. analogous structures d. repetitive structures e. vestigial structures
Acute pulmonary edema:
A) commonly results from right-sided heart failure. B) results in excess elimination of carbon dioxide. C) is characterized by progressively worsening dyspnea. D) impairs oxygen diffusion into the pulmonary capillaries