How has the expansion of the universe affected the cosmic microwave background radiation? A. It has caused it to red-shift.
B. It has caused it to blue shift.
C. It has caused it to cool.
D. It has caused it to heat up.

Which of these best describes an ionic bond?

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?