How do you think a farmer can best to conserve soil?

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

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

What gases are carried by the blood