Catalyst- chemical that increases the rate of a chemical reaction without itself being changed from the reaction. Enzyme- substance produced by a living organism that acts as a catalyst to bring about a particular biochemical reaction. Hope it helps.
Answer:
B
Explanation:
because dogs don't do c,The owner trains the dog to do a,d and b is naturally learned
The answer to the question is "B. Roman Numerals"
Grass is biotic- living.
please vote my answer brainliest. thanks!
