Which of the following soil horizons is topsoil?

a. the C horizon
b. the B horizon
c. the A horizon
d. the O horizon


c

Biology & Microbiology

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Frequency of an X-linked recessive allele in males equals

A) p2. B) 2pq. C) q2. D) q.

Biology & Microbiology

Egg-laying mammals

a. have no nipples yet produce milk. b. are commonly found in North America. c. are hairless. d. are confined to South America. e. bear their young into permanent pouches.

Biology & Microbiology

Refer to the accompanying figure. Which structure would carry blood to the systemic (body) circulation?

a. 1 b. 2 c. 6 d. 7 e. 14

Biology & Microbiology

People with lactose intolerance do not have enough ________

A) lactose B) lactase C) glucose D) fructose

Biology & Microbiology