The ____ horizon tends to accumulate mineral ions but relatively little organic matter, and is generally penetrated by

mature tree roots?



a. A horizon
b. B horizon
c. C horizon
d. D horizon
e. O horizon


ANSWER: b

Biology & Microbiology

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The Chlorophyta are believed to be the ancestors of fungi and animals

Indicate whether the statement is true or false.

Biology & Microbiology

The functional group shown above is ____

a. a carbonyl group b. a hydroxyl group c. a phosphate group d. an amino group e. a carboxyl group

Biology & Microbiology

How would the process shown in the illustration be different if this were a plant cell instead of an animal cell?



a. If this were a plant cell, the cells would be larger.
b. If this were a plant cell, the process would result in four cells instead of two.
c. If this were a plant cell, a cell wall would form instead of a contractile ring.
d. If this were a plant cell, the color of the nucleus would be different.

Biology & Microbiology

How is natural selection related to sexual reproduction as opposed to asexual reproduction?

A) Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction. B) Sexual reproduction results in the greatest number of new mutations. C) Sexual reproduction allows the greatest number of offspring to be produced. D) Sexual reproduction utilizes far less energy than asexual reproduction.

Biology & Microbiology