The two X chromosomes are are homologous but X and Y are not
All the domestic breeds of dogs that we are familiar with, from chihuahuas to pit bulls, are the same species: Canis lupus<span> familiaris. In fact, our dogs are a subspecies of </span>Canis lupus<span>, or ->*wolf*<-</span>
The answer is mechanical energy is converted to chemical energy during photosynthesis.
I think it is ovulation..
