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).
Around 28800 times a day. Hope this helps :)
Answer:
Dry mount
Explanation:
so you can examine the soil better and with a wet mount the soil gets all muddy and clumpy
A.) The cell prepares for cell division.
I think it is A but i am not sure
