A ________ is a circular ocean current caused by wind and the presence of continents
Fill in the blank(s) with correct word
gyre
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During spermatogenesis, each primary spermatocyte divides to eventually produce ________ spermatids
a. 1 b. 2 c. 4 d. 8
The purpose of meiosis I is
A. to create 4 haploid cells. B. to separate homologous chromosomes. C. to replicate chromosomes. D. to repair errors in DNA synthesis. E. to separate sister chromatids.
Choose the true statement about foreign DNA in the human genome.
A. Most of the foreign DNA in the human genome is coding DNA. B. New foreign DNA is regularly entering the human genome. C. Most of the foreign DNA in the human genome is ancient. D. Like the Drosophila genome, the human genome is constantly eliminating its foreign DNA.
Evolutionary biologists and geologists recognize the "big five" mass extinctions and are actively studying a potential sixth. Which of these describes that potential sixth mass extinction?
A. The extinction that included the dinosaurs B. The great flood of Noah C. The current extinctions, caused primarily by human activities D. The mass extinction that occurred in the Proterozoic, before animal life E. The end-Carboniferous mass extinction, which affected plants, not animals