Cross: heterozygous male and homozygous recessive female.

The result when heterozygous male and homozygous recessive female crosses is Mf, Mf, mf and mf

Explanation:

let Mm represent heterozygous male

let ff represent homozygous female

i.e Mm X ff= Mf, Mf, mf and mf

this implies that their would be two dominant heterozygous male and two recessive heterozygous female

the answer is "a.) well–developed vascular system."

explanation:

the answer to your question is tooth decay.