During which phase of meiosis does crossing over of chromosomes occur

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

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 was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above