Scientists on the side of earth opposite the epicenter of an earthquake detect mainly a. p waves. b. s waves. c. transverse waves. d. surface waves

a. P waves.

Explanation:

P. Waves are the fastest waves that a sismic activity releases, P. waves can travel through solids and liquids, this includes the inner layers of the planet, that is why if there is a lab on the opposite side of the epicentr of an earthquake it would detect mainly just P waves, since they are the only ones that can travel through the core of the earth.

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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).