Thermal energy is removed from a sample of helium all of the changes will result from this except A. The molecules will become more packed B. The temperature of the system will decrease C. The total energy in a system will increase D. the molecules of the system lose kinetic energy

The image shows embryos of three vertebrate classes

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.

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?