Modern biologists have identified two main factors that drive speciation. What are these factors?
What will be an ideal response?
The factors are isolation and genetic divergence.
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Which of the following is an example of a peptide hormone?
A. insulin B. adrenaline C. cortisol D. testosterone E. progesterone
The molecule in the accompanying figure is the pyrimidine ____, which is typically found in DNA but not RNA
a. thymine b. adenine c. uracil d. guanine e. cytosine
The hominid australopithecines are generally accepted to be different from modern humans because
A. human arms are longer than legs. B. only humans are meat-eaters. C. the human skull is apelike in appearance with a strongly projecting face. D. only humans are bipedal. E. human brains on an average are at least twice as large in size.
Pulmonary veins carry
A. deoxygenated blood. B. oxygenated blood. C. a mixture of oxygenated and deoxygenated blood.