Why is the ventricle a stronger muscle than the atria? when blood leaves the ventricle and goes to the body, why isn't the blood 100% oxygenated (in a frog)?

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

the growth of the plants is affected by the heat of the light. what is the student doing?