Which soil component(s) have a negative charge that attracts positively charged mineral ions in soil water?

a. sand
b. silt and sand
c. clay
d. humus
e. clay and humus


e

Biology & Microbiology

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The hormone __________ is involved in a positive

feedback cycle that results in strong uterine contractions during labor. a. estrogen b. oxytocin c. cortisol d. progesterone e. prolactin

Biology & Microbiology

The process by which microorganisms cause diseases is known as

A) pathogenesis. B) virulence. C) LD50 (lethal dose50). D) infection.

Biology & Microbiology

The purines of DNA are

A. adenine and guanine. B. thymine and adenine. C. serine and threonine. D. thymine and uracil. E. thymine and adenine AND thymine and uracil.

Biology & Microbiology

Newborn humans face thermoregulatory challenges as do small mammals. One mechanism they use to generate heat is

A. shivering thermogenesis in "brown fat." B. nonshivering thermogenesis in "brown fat." C. convection in "brown fat." D. evaporation in "brown fat." E. radiation in "brown fat."

Biology & Microbiology