Pl help A teacher looks at his students test to see which topics his students are still struggling with. What is this a Observational Study or Survey or Experiment?

Sperm pass through the and connect to a short ejaculatory duct. vas deferens prostrates seminiferous tubules none of the above

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

Suppose you use three different scale to weigh a bag of oranges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of oranges is 2.153 lb. which of the following best decribes these results?