Dissolution and precipitation of are the main processes that form limestone caves?
a. calcite
b. sandstone
c. clay
d. salt water

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

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Which of these is not a nucleotide base found in dna?