Researchers are conducting a study to determine the effects of vitamin d on the human body. the study involves providing pills that contain vitamin d to one group of human subjects and pills that do not contain the vitamin or other active ingredients to another group of people. the pills that do not contain vitamin d are

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d

What are the proteins in connectivity tissues of your foot examples of?