Why is it necessary to divide the plants into two groups (a control group and an experimental group)

Explanation:

The groups should be divided into control and experimental groups because; in the control group the plants would not be subjected to the independent variable or treatment which the experimental groups would. Hence there would be answers to the experiments and a wide range of data and analysis to be collected and conclusions to be drawn

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times