What is the difference between an organism's habitat and its ecological niche?

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

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"