In an eight-cell embryo of an organism, the cells of the upper tier are aligned directly over the cells of the lower tier. which organism is it likely to be? . a) earthworm. b) snail. c) starfish

I think the correct answer among the choices listed above is option C. The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.

Infants grow about 3/4 inch per month during the first year, increasing their birth length by about 40 percent by their first birthday. Thus, the answer to the question is 3/4 inch during the first year upon giving birth of the mother.