I think it’s C but not precisely sure about it
False
their legs were made form the spine of stingrays and they were used to ward of bad storms.
<span>Genetic variation can be caused by mutation (which can
create entirely new alleles in a population), random mating, random
fertilization, and recombination between homologous chromosomes during
meiosis (which reshuffles alleles within an organism's offspring)</span>
13-13= 0, 19-13= 6, so then 0-6= -6
