What is represented by the base root of a phylogenetic tree? the extinction of the species the origin of the species evolution of populations over time where a population splits into two.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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