C. Gradual
Hope this helps!
I think it A because Cyanobacteria absorb co2 from the atmosphere and then release oxygen To the atmosphere
Well, when chromosomes cross over during prophase 1 of meiosis, the homologous pair of chromosomes exchange segments of DNA which happen to be the genes. So the significance of crossing-over during prophase 1 is that it adds genetic variation to sexually reproducing organisms.
Interphase- D prophase-C anaphase-A telophase/cytokinesis-E