The carbon footprint of an activity is used to assess environmental pollution. what does it measure?

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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