Fossils of Cooksonia represent the oldest known fossils of vascular plants. Such fossils date to about
a. 1.5 billion years ago.
b. 425 million years ago.
c. 250 million years ago.
d. 125 million years ago.
e. 17 million years ago.
B
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Which of the following is not a member of the phylum Platyhelminthes?
a. fluke b. tapeworm c. flatworm d. ribbon worm
_______ is a change in DNA that can be beneficial, detrimental, or have no effect on a given population.
a. Gene flow b. Genetic drift c. Mutation d. Natural selection
Species of fossil organisms are morphospecies, which means they are defined on the basis of ________
A) DNA sequence similarities B) mate recognition behaviors C) anatomical features D) ability to interbreed E) the locations where they are found
An anaerobic prokaryote engulfs a prokaryote capable of using oxygen to produce energy. The anaerobe could now perform
A) both photosynthesis and aerobic metabolism. B) aerobic metabolism. C) photosynthesis. D) only anaerobic metabolism.