Answer:
The depth at which Drew found the algae
Explanation:
The dependent variable was the depth at which he found the algae, because that is what he measured on each day.
The independent variable was the sky conditions, since that changed from clear to cloudy, which impacted the dependent variable/the depth of the algae.
Systemic circulation is the circulation of blood through<span> the arteries, capillaries, and veins of the general system.
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Answer:
The answer should be 
Since the pedigree has two different letters, it will have one letter of each, but the DNA will still be A.
The build up of lactic acid will need oxygen to break it up. Lactic acid is why muscles feel tired after excess exercise