Enzymes are protein catalysts. What is the role of a catalyst? A. Provides extra energy for a reaction
B. Lowers the activation energy of a reaction
C. Allows only irreversible reactions to happen
D. Eliminates the activation energy of a reaction

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

Explain how organisms could be harmed by high levels of salt from roadways?