Which drug is a depressant?
a) nicotine
b)alcohol
c)caffeine
d)antibiotic

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal