In an experiment over osmosis, animal egg cells were placed into different solutions. Water was observed moving into and out of the eggs. What caused the water to move?

a
The plasma membrane used energy to move the water to equlibrium
b
The cell used selective permeability to get a drink of water
c
The different solutions created a concentration gradient and water naturally seeks equlibrium
d
The salt or sugar pushed water into the cell

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.