Answer: So that the experimenter is able to compare and contrast between the control group and the variable group. This will help the experimenter come up with data conclusion during their experiment:)
<span>The range of human hearing is generally considered to be 20 Hz to 20 kHz, but it is far more sensitive to sounds between 1 kHz and 4 kHz. For example, listeners can detect sounds as low as 0 dB SPL at 3 kHz, but require 40 dB SPL at 100 hertz (an amplitude increase of 100).</span>
The answer is B) A Eukaryotic animal
The answer is D<span>. Cell walls are made of cellulose. Cell membranes are made of proteins and phospholipids
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Answer: National park service
Explanation:
