To test the prediction that increased phosphorous levels in lakes lead to increased minnow populations, scientists survey 20 lakes across Minnesota, measuring phosphorous content and quantifying minnow abundances. This is an example of what type of scientific approach?
What will be an ideal response?
A natural experiment
Biology & Microbiology
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Paired excretory organs found in most body segments of segmented worms are called ____
a. metanephridia b. parapodia c. septa d. clitella e. setae
Biology & Microbiology
A(n) _____vehicle is a single material that serves as the course of infection for many individuals, such as a contaminated water source
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The effect of acetylcholine on heart muscle cells is to
a. stimulate one contraction. b. increase the rate of beating. c. decrease the rate of beating. d. relax the heart.
Biology & Microbiology
Cortisol and aldosterone are secreted by the ________
Fill in the blank(s) with correct word
Biology & Microbiology