Assuming the carbon cycle is a closed system, which of the following statements is true?
a. mass and energy are conserved in the carbon cycle.

b. as population sizes increase, more carbon is produced.

c. when all the fossil fuels are used up, there will be no more carbon.

d. the sun absorbs energy from the carbon cycle.

Which type of scientific statement is defined as a hypothesis or group of hypotheses that can be accepted as true based on the repeated experimentation with similar results

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.

Amines amides and amino acids are categories of