Minhas desculpas, eu não falo português. Espero que você encontre alguém que faça !! Obrigado pelos pontos. :)
Answer:
The cardiovascular system helps maintain homeostasis by continually supplying the central nervous system--the brain and spinal cord--with oxygen and glucose. Brain cells start dying after just one minute without oxygen. The brain is the control center for all of the body's homeostatic processes.
Answer : Hydrogen.......:
No, it would not be possible since both alleles in the genotype are recessive. If the alleles were xx for square jaws, then
x x
x xx xx
x xx xx
would be the possible genotypes for the offspring