Mammals and birds are descendents of reptiles, but are not included within the taxon Reptilia. As a taxon Reptilia is...
A. monophyletic.
B. polyphyletic.
C. paraphyletic.
D. a supergroup.
E. a kingdom.
C. paraphyletic.
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Why is blood pressure low in fish? a. Blood must flow through sinus venosus
b. Water enters slightly deoxygenated. c. Fish are not susceptible to hypertension conditions. d. Blood does not return back to the heart.
The coronary arteries supply blood to cardiac tissue. Which chamber of the heart requires the greatest amount of blood supply to keep it working?
A) right ventricle B) left ventricle C) left atrium D) right atrium
Some of the stages of meiosis are listed below. For the following statements, select the best choice of these stages.
A. Pairing of homologues occurs during this stage. B. New genetic combinations are present after this stage. C. Recombination via crossing over occurs during this stage. D. E. During this phase, homologues separate. F. During this stage, the sister chromatids begin to separate. G. By the end of this phase, a nuclear envelope forms around each set of haploid chromosomes. H. Following this phase, each individual cell is haploid.
The process by which homologous chromosomes exchange genetic material
a)is crossing over. b)is random fertilization. c)occurs only in bacteria. d)occurs only in animals. e)is independent assortment.