Factor affecting reaction rates?

Question

Identify the major factor affecting reaction rates that accounts for the following abservations:

1. tadpoles grow more rapidly near the cooling water discharge from a power plant.

2. enzymes accelerate certain biochemical reactions, but are not consummed.

3. Campfires are started with twings rather than logs for wood.

4. Iron and steel corrode more rapidly near the coast of an ocean than in the desert.

please help!

Answer 1

1. increased temperature

2. catalyst

3. increased surface area

4. presence of moisture, or salt (catalyst).