Which event and date is mismatched?
A. origin of eukaryotic cells-2.2 billion years ago
B. origin of life-4.8 billion years ago
C. origin of multicellular organisms-650 million years ago
D. All the choices are incorrect.
Answer: B
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A) acetogens B) anoxygenic hydrocarbon fermenters C) methanogens D) methylotrophs
Freshwater lakes in temperate regions will turn over in the ____
a. fall only b. winter only c. spring only d. summer only e. fall and spring
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A. cortex B. epidermis C. pericyte D. endodermis