Look at the picture below. Scientists have noticed that the limbs of vertebrates are all built upon the same basic structure. What conclusion have scientists made based observations?

oak trees? ? what was listed

one would be wind another would be water density

"a.) well–developed vascular system."

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