During which phases of the cell cycle are chromosomes composed of two chromatids?

How does a gymnosperm prevent itself from pollinating the same tree

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.

Select the word from the list that best fits the definition the temperature to which air must cool to be saturated