Scientists have concluded that large mammals, such as the woolly mammoth, roamed the earth before the ice age. how do we know that the woolly mammoth was alive in the ice age?

The dating of artifacts is done by a carbon dating age system based on the development of tools and technology. They used the carbon that is left in the artifacts of the deceased.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

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.