What is the reason why an investigation is planned

It's planned so you know what you are doing during the experiment. If you don't plan something ahead of time then you forget what you need to do. Also you need to remember specific formulas and numbers.

Heya dearfirst love doesn't matter what the it's just happen so we cannot say that minor in love with someone over 18 years old

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i