One of the finest available sequences of fossils shows how horses have changed slowly and by subtle steps from small, shrub-browsing ancestors to the large, grass-grazing modern horse. A large number of fossil species have been named, and it is often
difficult to decide on the identity of a fossil horse because transitional forms are common. This record of evolution best fits the idea of
A) the gradual model of speciation.
B) punctuated equilibrium.
C) adaptive radiation.
D) hybrid breakdown.
Answer: A
You might also like to view...
Alum is an adjuvant
Indicate whether this statement is true or false.
Which of the following is a difference between prokaryotes and eukaryotes?
a. In prokaryotes, the DNA is sequestered inside the nucleus; in eukaryotes, it is in the cytoplasm. b. In eukaryotes, transcription starts with a final copy of mRNA; in prokaryotes, there is pre-mRNA, and it must be edited to make the final transcript. c. In eukaryotes, translation only occurs after transcription; in prokaryotes, they happen simultaneously. d. In prokaryotes, there are exons and introns; in eukaryotes, there are neither of these.
Kelp beds are considered important because they support large
a. fish. b. sea urchins. c. diverse communities. d. sea otters. e. sharks.
Density-independent controls over population
growth include
a. parasites. b. temperature. c. disease. d. competition. e. all of these