What did Charles Darwin propose after observing the 11-inch-long nectaries of the Angraecum sesquipedale orchid in Madagascar?
A. that the orchid was an evolutionary dead end and could no longer reproduce
B. the existence of a pollinator moth with a proboscis of 10–11 inches
C. the presence of very small bees that can fit into a long nectar tube
D. that the orchid must reproduce asexually
E. that the orchid was a self-pollinator and required no assistance from an organism
B. the existence of a pollinator moth with a proboscis of 10–11 inches
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Which of the following provides the likeliest explanation for the differences seen in the human population?
A. presence of parasites in different areas B. amount of sunlight in different areas C. the altitude in different areas D. natural selection
Why don't all changes in DNA result in mutations? a. Mutations are never expressed
b. None of these choices. c. The cell never makes a mistake during transcription. d. The cell never makes a mistake during translation. e. The same amino acid can be produced by a variety of codons.
All perennials have secondary tissues
Indicate whether the statement is true or false.
During the cephalic and absorptive phases, the pancreas releases a great deal of __________ into the blood stream and very little __________.
Fill in the blank(s) with the appropriate word(s).