Which of these particles is able to pass freely through a cell membrane? A. A nucleic acid molecule B. A disaccharide molecule A C. A polysaccharide molecule OO D. A carbon dioxide molecule

What evidence is there that convection occurs in earth’s troposphere?

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

Which organ controls breathing? lungs alveoli heart diaphragm