Which of the following must be true for diffusion to occur? Molecules or particles must have different sizes.

Special protein channels must always be available.

There must be areas of different concentrations.

Energy must be available.

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Will mark you as ! keiko’s teacher was discussing the theory of endosymbiosis. she asked keiko to mark the organelles in the diagram that most closely resembled prokaryotes. which organelles should keiko mark? * the first image is the question and the second image is some information to you answer the !

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic