If it is a healthy environment then the atmosphere will be happy meaning no dirty streets etc
There is only two possible offspring.
Bb and bb
Homo is the same
Hetero is different
b b
B <u> Bb </u> <u> Bb</u>
b <u> bb </u> <u> bb </u>
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.