Place the developments in evolutionary history in the proper time frame.

i) charles darwin writes 'on the origin of species'.

ii) lamarck writes about evolution through acquired traits, using a giraffe as his model.

iii) dna sequencing is developed, allowing the comparison of the genes of different organisms.

iv) malthus, an economist, writes about the inevitability that people will exhaust a food supply by reproducing too often.