If the activation energy needed for a chemical reaction is decreased by the presence of a

Presence or Absence of a Catalyst

Catalysts are substances that increase reaction rate by lowering the activation energy needed for the reaction to occur. A catalyst is not destroyed or changed during a reaction, so it can be used again.

Explanation:

there is no stairs in bungalow

explanation:

poof

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.