Each pollen grain produces two cells, one of which may develop into a(n):
a. polar nucleus.
b. pollen tube.
c. anther.
d. compound pistil.
e. filament.
b
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The secondary structure of proteins can be
a. helical. b. sheetlike. c. globular. d. fibrous. e. both helical and sheet-like.
Which of the following is the most important in order for organisms to facilitate social behavior?
a. There must be a large population. b. All present must be of the same species. c. All present must have the same genetic imprinting. d. There must be a mechanism for communication. e. No outsiders can be allowed to enter the group.
Without the activities of microorganisms, the functioning of Earth's ecosystems would cease
Indicate whether the statement is true or false
The earliest Homo sapiens fossils are ca. 200,000 years old. Could you use radiocarbon dating to determine the age of fossils from that period? Briefly justify your answer in the space provided below
What will be an ideal response?