In the section "Investigating Life: Genetic Messages from Ancient Ecosystems," what was the advantage of looking for DNA samples in permafrost?
A) Most plants and animals evolved in Siberia.
B) It is easier to take solid core samples.
C) The enzymes that make DNA are still active in the cells.
D) The freezing temperatures preserve the DNA.
E) Areas with permafrost are older than other parts of the world, allowing scientists to collect samples back 1.5 to 2 million years.
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Q29: Flowers and fruits are unique to
A) angiosperms.
B)
Q30: In plants that have two haploid gametes
Q31: Mosses are an example of which of
Q32: The term "gymnosperm" means
A) "clothed ovule."
B) "naked
Q33: The structure of the angiosperm that supplies
Q35: Cycads are
A) trees that produce flowers.
B) bryophytes.
C)
Q36: Gymnosperms are less successful than ferns because
Q37: The two groups of angiosperms are
A) mosses
Q38: All angiosperms have their pollen and seeds
Q39: The fruits of plants function in
A) providing
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