Give three functions of the cell surface membrane. (plasma membrane)

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Consider this plant cell which organelle is labeled g

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine