Why were archaea and bacteria grouped together by biologists until recently? a. they look similar. b. they have very similar dna. c. they are both very ancient organisms. d. they both perform the same ecological function.

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.

How do living things obtain phosphorus

Isotopes of the same element have differ in their