At what stage of development is the embryo a hollow ball of identical cells? fetus
O zygote
O gastrula
blastula

Four types of motile cells in human body?

What form of anesthetic was used for field surgery

Which spheres are involved when sedimentary rocks formed from parts of seashells at the bottom of the ocean? a.) biosphere, atmosphere, geosphereb.) geosphere, hydrosphere, biosphere c.) geosphere, exosphere, hydrosphered.) hydrosphere, biosphere, atmosphere