An endoplasmic reticulum is rough or smooth, depending on the presence of

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

How do plants obtain more sunlight a.) they lean towards the light b.)they grow straight up c.) they only live in sunny areas, like the tropics d.) they stay low to the ground

In the presence of oxygen, glycolysis is followed a. the krebs cycle b. lactic acid fermentation c. alcoholic fermentation d. photosynthesis