What evidence exists that some of the asteroids were geologically active in the distant past?
a. A few of the larger asteroids show similar reflectance spectra (colors) similar to achondrite stony lava-like meteorites.
b. A few of the larger asteroids show similar reflectance spectra (colors) similar to carbonaceous chondrite meteorites.
c. A few of the larger asteroids show similar reflectance spectra (colors) similar to Jovian planets.
a
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Speciation is the divergence of two populations from a common ancestor. How does it contribute to biological diversity?
A. Speciation increases biological diversity. B. Speciation decreases biological diversity. C. Speciation has no effect on biological diversity.
Ricin is internationally considered as a
weapon. Its use is now banned in most countries according to the ____.
a. Madrid protocol. b. Paris protocol. c. Kyoto protocol. d. Geneva protocol. e. Vienna protocol
Approximately 40% of all children with Down syndrome have congenital ____________________ defects.Fill in the blank(s) with the appropriate word(s)
Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare, many plants have symbiotic relationships with
A. filamentous algae. B. mycorrhizal fungi in the soil. C. nematode worms in the soil. D. other plants. E. soil insects.