Which of the following adaptations of tundra plants does not specifically aid in surviving the cold? a) shallow roots b) dense hairs c) retention of dead leaves d) low to the ground

It's not shallow roots, because most plants would get permafrost if they go any deeper. The dense hairs help keep the plants get enough heat. It's not low to the ground because the plants from getting harsh winds and even colder temperatures above the snow. So by elimation and the fact that I can't think of a use for the last one, I concluded that C rentention of dead leaves is the correct answer. Hope this helps :)

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products