Refer to the accompanying figure. Which region of the skin is composed mainly of collagen fibers?
a. 1
b. 6
c. 11
d. 14
e. 15
e
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Parapatric speciation occurs most often ____
a. within in the same home range b. populations inhabiting different areas while maintaining contact along a common border c. within a group of interbreeding populations d. on either side of geographic barriers e. by polyploidy
In many species, there are two representatives of each chromosome. In such species, the characteristic number of chromosomes is called the ________ number. It is usually symbolized as ________
A) haploid; n B) diploid; n C) diploid; 2n D) haploid; 2n E) None of the answers listed is correct.
Studies suggest that to become malignant, neoplasms must establish
a. contact inhibition. b. a blood supply. c. a nutrient source. d. a second genetic mutation. e. a mutation
A species of bacteria is a distinct type of bacteria that can sexually produce viable offspring when it mates with others of its own kind.
a. true b. false