Need help answering the questions

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?

Which animal is a producer in this ecosystem

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give