Exothermic reaction is right answer
Answer:
Option (D)
Explanation:
In terms of chemistry, a catalyst is usually defined as the substance that is commonly used in a reaction in order to increase the rate of reaction, without getting consumed. It helps in the reduction of activation energy.
In the given case, the lever or a person can be considered as a catalyst because both of these will increase the efficiency (or rate) in removing the rock from the top of the perch. Thus, the lever or the human will remain the same after the removal of rock as a catalyst can be recovered after the reaction.
Therefore, the correct answer is option (D).
A) Species extinction - This is because animals will lose their homes and will eventually, slowly die out.
and
D) Reduced oxygen - Trees provide us with oxygen
I hope this helps you. ☺
Yes, if it is a worthwhile project, others might want it done as well. Therefore, promoting it on social media will get your earnings higher.