Directional selection can be distinguished from disruptive selection by
a.
the elimination of extreme variations of traits
b.
selection for two extreme variations of a trait
c.
the preservation of gene frequencies
d.
selection for one extreme variation of a trait

What molecules does hemoglobin decay into over 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

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !