How long ago did Australopithecus afarensis live?
A) 50,000—100,000 years ago B) about 2.2 million years ago
C) 500,000 years ago D) about 3.2 million years ago
Answer: D
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This biome is the coldest, with the lowest biodiversity and a permanent layer of ice beneath the soil
A. alpine B. savanna C. taiga D. tundra E. temperate coniferous forest
Diatoms are algae whose silicon dioxide-containing shells are useful economically as
A. filters. B. fertilizers. C. stabilizers. D. thickeners.
Antisense mRNA can be used to regulate the expression of genes. Briefly describe how this technology was used to slow the ripening of Calgene's ill-fated Flavr-SavrTM tomato
What will be an ideal response?
All gametes contain :
a. two chromosomes. b. two identical sets of chromosomes. c. two different sets of chromosomes. d. one chromosome. e. one set of chromosomes.