Which of the following elements are represented in the spectrum hydrogen helium hydrogen and helium or calcium only

Observations show that interstellar clouds can have almost any shape and

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate

Question 1 of 15 2 points when doing science as inquiry, you should have some idea of what you think the final result will be. o a. true o b. false submit