Pls help I’m being timed

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

There are only about 250,000 known fossil species. true or false