The grand canyon was formed as a result of

a. deposition.
b. landslides.
c. erosion.
d. deflation.

What major structure can be used to tell apart the embryos of acoelomates pseudocoelomates and coelomates?

The model illustrates a process by which a substance is taken up by a cell

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