Teratogens affect the ____ more than any other part of the fetal body
a. central nervous system
b. upper limbs
c. heart
d. lower limbs
e. external genitalia
a
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Reproductive success of an individual is known as:
A. variation. B. adaptive makeup. C. fitness. D. microevolution. E. macroevolution.
What has occurred to bring about this specialtion?
A storm blows a small group of migrating birds off course and they land on an island too far from the mainland for them to fly back on course. The birds remain on the island for 100 generations when a second storm blows more birds from the mainland to the island. The new birds cannot mate with the established birds, even though they are originally from the same population. A. Genetic drift. B. Doubling of chromosome number in the mainland birds. C. Geographical isolation resulting in reproductive isolation. D. Development of a reproductive isolating mechanism dealing with sperm count. E. All of these.
Extant microorganisms are organisms from the fossil record that are no longer present on Earth today.
Answer the following statement true (T) or false (F)
Of the twenty amino acids available for protein synthesis, how many must be obtained by dietary means?
a. 0 b. 2
c. 4 d. 8 e. 10