Fetal development occurs during which time frame after fertilization?
Answer: 3-9 months
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The asteroid impact of about 65 million years ago led to the extinction of
a. sequoia trees. b. giant redwood trees. c. dinosaurs and some other life forms. d. giant squid. e. undersea creatures similar to the "Loch Ness Monster."
Prop roots are more common in:
a. annuals. b. eudicots. c. monocots. d. epiphytes. e. parasitic plants.
Which of these diagrams represents an age structure diagram of more-developed countries?
A. Diagram A B. Diagram B
Which of the following statements about methyl-directed mismatch repair systems is FALSE?
A. Methyl-directed mismatch repair systems are most often used to correct pyrimidine dimers. B. Methyl-directed mismatch repair systems require exonucleases. C. Methyl-directed mismatch repair systems require the concerted actions of several proteins. D. Methyl-directed mismatch repair systems recognize incorrectly matched base pairs in the DNA. E. Methyl-directed mismatch repair systems exist in all species.