Two parents with a genotype Pp, what is true about their
offspring's phenotype?

Expectation is that 75% of offspring will have the dominant phenotype, 25% the recessive phenotype.

Explanation: Pp x Pp gives expected offspring genotypes PP (25%), Pp (50%), pp (25%).

If P is dominant, the expectation for phenotype ‘P’ = 75% and for phenotype ‘p’ = 25%

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds