In streams and rivers, decomposition occurs primarily in

A) riffles.
B) pools.
C) runs.
D) rapids


B

Biology & Microbiology

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A researcher comes across a plant that has been infected by a pathogen. As a result of the infection, the plant has undergone a systemic acquired resistance (SAR) response and has also generated several siRNAs

Based on this response, what type of pathogen most likely infected the plant? A. a bacterium B. a virus C. a fungi D. an oomycete E. a parasitic plant

Biology & Microbiology

The process of nitrification is the conversion of ____

a. N2 ? NH4+ b. NH4+ ? N2 c. N2 ? NO3- d. NO3- ? N2 e. NH4+ ? NO3-

Biology & Microbiology

The number of species on an island depends on the size of the island and its distance from a mainland. This statement would most likely be made by _____

a. an explorer b. a biogeographer c. a geologist d. a philosopher

Biology & Microbiology

The diameter of most animal and plant cells ranges from

A) 0.1 to 1.0 micrometers. B) 1.0 to 10 micrometers. C) 10 to 100 micrometers. D) 100 to 1,000 micrometers.

Biology & Microbiology