Which of the following statements is true?
A: all the populations in an ecosystem form a community
B: a habitat represents all the biotic factors in an ecosystem
C: The amount of nutrients in soil is an example of a biotic factor
D: Only one population can live in a habitat at a time

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