Which of the following best summarizes the passage? A. Volcanic rocks and mountains are on Hawaiian islands.
B. Green volcanic rock has a heavy concentration of iron and magnesium.
C. Sand is tiny bits of worn-out rock made mostly of oxygen and silicon.
D. A few common elements make up most of the planet's many compounds.

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

d. changes in climate and historical records

hope this