When the concentration of molecules are the SAME on both sides of the cell membrane, the solution is *
A. Hypertonic
B. In equilibrium
C. Hypotonic
D. Kinetic

isotonic: in equilibrium.

Explanation:

tonicity is the relative concentration of solutes dissolved in solution which determine the direction and extent of diffusion. if let's say sodium is the same both inside the cell membrane and outside the cell membrane then it is isotonic in equilibrium.

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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?