Habitat fragmentation has forced many species into smaller habitats, which results in increased mortality within populations. To give these species access to larger habitats, wildlife biologists developed
A) minimum critical areas.
B) enormous water tanks.
C) diverse communities of plants.
D) underground tunnels for animal movement.
E) wildlife corridors.
E
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Consider the phylogenetic tree shown above. Geographic labels indicate the origin of humans sampled for mtDNA sequence analysis. Chimp is the outgroup. Which of the following statements is correct?
A. The tree supports the "out of Africa hypothesis" for the origin humans because it implies that the common ancestor of all the humans is of African origin. B. The tree does not reveal anything about the geographic original of humans. C. The tree supports the multi-regional hypothesis because there are four independent populations. D. The closest relative to the Kenyans are the English. E. The Chinese share a more recent common ancestor with the Ethiopians than the Kenyans.
How is movement in vertebrates analogous to the movement of a lever?
What will be an ideal response?
A deletion occurs in a gene that encodes DNA polymerase III so that no functional DNA polymerase III is produced. What will be the most likely consequence of this mutation?
a) The DNA strands would contain pieces of RNA. b) The DNA would not exist in a supercoiled state. c) There would be no DNA replication on the leading or lagging strands. d) There would be no RNA primers laid down. e) The DNA will not be able to unwind to initiate replication.
Microbes that naturally live within mammalian hosts are
a. psychrotolerant. b. mesophiles. c. thermophiles. d. xerophiles.