Rainbow trout are found in mountain streams and are sensitive to changes in their habitat. Which would be the best description for the use of rainbow trout in water quality testing?
A. biological indicator
B. invasive species
C. nitrates
D. dissolved oxygen

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

What materials must dams have to produce electricity, and what must occur?