Which example represents an abiotic factor in an aquatic ecosystem? Choose the correct answer.

A. Water lilies float on top of a pond.

B. A population of bass lives in a lake.

C. The pH of a lake is decreased by acid rain.

D. Dragonflies feed on small insects near a pond.

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere