Which of these subshell designations are possible and which are impossible?

2d,2p, 3f, 1s, 0p

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

Which description provides the best objective summary of the article in the passage?

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.