During the gastrula stage of embryo development, the cuplike opening becomes the mouth in _[blank]_.

placental mammals

chordates

deuterostomes

protostomes

Discuss the functions of epithelial connective nerviud and muscular tissues

Explain the significance of thesaurus geographicus

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures