Which viewpoint is best for evaluating a position for rotation?

Red blood cells carry ________ molecules.

A. plasma B. fibrinogen C. heparin D. hemoglobin

The ________ is a highly coiled tube that receives spermatids from seminiferous tubules as these cells are formed and where spermatids mature to become sperm cells.

Fill in the blank(s) with the appropriate word(s).