A scientific law describes a behavior of something that occurs
Because for the strands to form a double helix the base pairs have to match perfectly (adenine with thymine and cytosine with guanine) in DNA , and if a strand of RNA is paired with a split strand of DNA it goes adenine with uracil and cytosine with guanine (uracil replaces thymine)
It's either the tradeoffs between conservation and economic development or the potential benefit to farmers.
Swim bladder I believe
Hope this helps