What is the chemical code that makes up most of the chromosomes?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

What is characteristics of the troposphere

The moon has a bigger influence on our oceans than the sun because the moon is closer to the earth than the sun the sun is only made of gas and the moon is solid the magnetic attraction of the moon makes gravity stronger the water on the moon attracts the water on the earth