What does the term "smokeless tobacco" refer to? select all that apply?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

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