The current geological era is the ________
A) Paleozoic
B) Cenozoic
C) Mesozoic
D) Cambrian
B
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Which soil horizon has no organic matter or weathered rock?
a. O Horizon b. A Horizon c. B Horizon d. C Horizon e. bedrock
What types of plants would you expect to find in an alpine tundra?
A. tall trees B. aquatic plants C. lichens and mosses D. tall grasses E. cactus
Most species produce large numbers of offspring by sexual reproduction. This is important to the theory of natural selection because
A. each individual is unique and this diversity allows selecting agents to operate. B. selecting agents often lead to the death of large numbers of offspring. C. the diversity shown in the offspring makes it highly likely that some of them will be able to reproduce successfully. D. All of the choices are correct.
Which process is absolutely necessary for asexual cellular reproduction to occur in eukaryotes?
A. Prokaryotic fission B. Mitosis C. Meiosis D. Doubling of chromosomal number in descendent cells E. Growth factor activation