Neanderthals appeared how many years ago?

a. ˜800,000
b. ˜600,000
c. ˜300,000
d. ˜250,000
e. ˜100,000


d

Biology & Microbiology

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The Montreal Protocol banned use of _____ , which contribute(s) to ozone depletion

a. DDT b. CFCs c. fossil fuels d. sulfur dioxides

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The twisted ladder shape of DNA is a result of the covalently bonded building blocks called

A. sterols. B. nucleotides. C. amino acids. D. monosaccharides. E. phospholipids.

Biology & Microbiology

Which structure gives rise to microtubules?

a. intermediate filaments b. flagella c. collagen d. microfilaments e. centrioles

Biology & Microbiology

Endosperm is found in

A. ferns. B. mosses. C. gymnosperms. D. horsetails. E. angiosperms.

Biology & Microbiology