Si el embarazo dura 9 meses xq los doctores cuentan 40 semanas

hammurabi rulers

good lesson

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

maybe because its impossible for balloons to lift a whole entire house.