A variety of finch species within the Hawaiian Islands have acquired different types of beaks needed for utilizing specific food resources. The process by which these different species of finches came about is likely to have involved
A. natural selection.
B. evolution.
C. an accumulation of harmful genetic mutations.
D. both natural selection and evolution.
E. None of these choices are correct.
Answer: D
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Which of the following is used to describe the openings to the hearts in animals with open circulatory systems?
a. atria b. ostia c. septa d. ventricles
Animals that generate body heat metabolically at some times and from the environment at other times are referred to as ________
Fill in the blank(s) with correct word
Given the following events involved in the regulation of blood volume, which one of the following answers best represents the order in which these events occurs?
1. sodium reabsorbed from distal tubules and collecting ducts 3. secretion of renin from juxtaglomerular apparatus 2. secretion of aldosterone 4. decrease in blood volume 5. production of angiotensin II A) 4, 2, 5, 3, 1 B) 4, 5, 2, 1, 3 C) 2, 3, 4, 1, 5 D) 4, 2, 5, 1, 3 E) 1, 4, 5, 2, 3
Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
A) alanine; is a simple methyl group B) glycine; is a hydrogen atom C) glycine; is unbranched D) lysine; contains only nitrogen E) proline; forms a covalent bond with the amino group