The fossis record shows that the types of living things on earth changed over time. Which fossil would most likely be found in the oldest rock layer

a- mastodon

b- trilobite

c- saber tooth cat

d- flying dinosouar

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick

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