Yes, I believe it's <span>A. must be testable. So it can either be proven or disproved.
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It's harder to find one of the many genes involved in a polygenic trait vs the only gene involved in a discrete trait.
The DNA molecule is composed of two strands with the help of hydrogen bonds which is doubl helix <span> At each end of the double helix, one strand is 5' and the other is 3'.the two strands are anti parallel so the correct option is
</span> They are oriented in opposite directions
The answer is A I hope i helped.
