Serenitybella

13.10.2020 • 

Biology

A controlled experiment is a means for carrying out a fair test of a hypothesis. In a controlled experiment, all of the variables that can influence the outcome variable (dependent variable) of the experiment are controlled or held constant, except for the test variable (independent variable). Which of the following hypotheses would NOT be tested using a controlled experiment? A. A biologist’s hypothesis that increases in average temperatures causes an increase in honeybee population.
B. A geologist’s hypothesis that acid rain weathers sedimentary rock more rapidly than igneous rock.
C. A geologist’s hypothesis about how the Grand Canyon formed
D. A biologist’s hypothesis that use of fertilizer increase the growth of grass

Ответ:

ashleyprescot05

22.03.2021

Biology

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Cyanobacteria are blue-green algae that produce chlorophyll and undergo photosynthesis. Oxygen, a byproduct of that photosynthesis, was released into the atmosphere, changing it in such a way that it may have allowed the evolution of more complex forms of life.

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