Which of the following contains stem cells that can produce only their own type of cells? 1) 6-week-old embryo 2) adult3) 3-day-old embryo 4) blastocyst

What effect does plate tectonics have an organic evolution

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false