What are the causes of high temperatures inside Earth?

Select all that apply Please?

friction caused by Earth’s fast rotation
radioactivity due to heavy elements
heat trapped from when Earth formed
various fossil fuels burning slowly

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.