Plzzz fast answerrr Which answer choices correctly describe why the number of known elements more then doubled by 1861

c

Explanation:

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)