To perform a testcross, scientists cross an organism with an unknown genotype with a homozygous recessive organism.
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Answer:
The skin is an organ of protection
Explanation:
The primary function of the skin is to act as a barrier. The skin provides protection from: mechanical impacts and pressure, variations in temperature, micro-organisms, radiation and chemicals.
PH 3 is the most acidic while pH 5 is the most acidic.
C, as A,B, and D aren't true.
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