Which of the following effects is produced by the cohesive properties of water molecules? Lakes do not freeze solid in winter, even at below freezing temperatures. Evaporation of water from a leaf's surface lowers the temperature of the leaf. Water flows upward from a plant's roots to the leaves in narrow tubes. Cells resist temperature changes, even as their internal processes give off heat.

i think its both a and b

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.