How are the limbs of the organism pictured above similar?

The structures given in the picture above are homologous to each other. Homologous structures are those, which belong to different organisms but are similar in their structure as they have a common acestory. The functions of these homologous structures may or may not be similar. The limbs of the human, horse, cat, bat, bird and whale share a similar basic structure. The function is more or less similar as far as these limbs are concerned.

check for the pregnancy rating of drug. if its class c or d see if other alternatives

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