Is a correct observation based on the photo shown below?

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?

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?

What type of plant is good for a bioassay and where can i buy it? i only have a month.