By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?
a) facilitated diffusion
b) aquaporins
c) extracellular enzymes
d) active transport
e) simple diffusion

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

i think the answer is g1

hope i

-lavira: )