Which of the following is not natural acquisition of immunity?
a. contact with a pathogen
b. antibodies passed on from mother to baby through breast milk
c. vaccination
d. antibodies passed on from mother to fetus through the placenta

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.

Draw the structure of dna nucleotide with adenine as nitrogenous base

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food