Answer:
true
Explanation:
a virus needs a host to replicate its like fleas they lay eggs on dogs to replicate
Answer:
Blood carries the oxygen through out the body and gets re-oxygenated to keep the body going.
Explanation:
Just trust me.
Answer:
4. Variations that help with survival will be passed on to future generations and will rapidly change the whole population.
Explanation:
Variations that help with survival MAY be passed on to future generations, depending on how much pressure that variation relieves. Change may not be rapid, depending on how fecund the species is. Also, it will not change the whole population, only future offspring. The current offspring won't all have the new variation.
