At boxing practice, Nathan works with his coach to improve the strength of his punch. Nathan lost his balance when he hit the bag with a hard punch. He says that's because of the reaction force from his punch, which was large because the bag is heavy. Is he correct?

Answer Choices
A. Yes, he is correct
B. No, it is not the weight, it is the large mass of the bag that gives the large reaction force.
C. No, the reaction force depends on the force of Nathan's punch, not the mass of the bag.
D. No, the bag does not exert a reaction force, because it is flexible.

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?