er:
Explanation:
In the lungs CO2 is removed from the blood and send out the body where we exhale
The virus' DNA becomes a part of the host cell's DNA, and every time the host cell copies and divides, it also copies viral DNA. The viral DNA may remain inactive (a provirus) for a long time, but it can become active when it frees itself from the host's chromosome, which triggers the lytic cycle.
I forget which one is the virus' DNA
Answer:
"U"-shaped, with peaks at the low and high extremes of beak size; disruptive selection
