Which are true about the embryonic and fetal stages? Check all that apply. The embryonic stage is the third to the eighth week after fertilization.
The fetal stage is the ninth to the thirty-eighth week after fertilization.
In the embryonic stage, the number of cells increases.
In the fetal stage, the number of cells remains the same.
An embryo is an early developmental stage that ends when all organs are present.

Why do carbohydrate molecules function so well as fuel for the body?

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids