Which of the following adaptions is working against the survival of koalas as global climate change causes Earths temperature to increase? 1. Large noses to smell when predators approach.
2. Thick fur that keeps koalas warm.
3.Gray fur that allows koalas to camouflage or blend I their surroundings to hide from predators.
4. Ears located on the tops of their heads for more sensitive hearing.

(hurry please i'm in a test with 30 mins left!!)

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.