1. Why do you think during the evolutionary process there was a correlation between brain size increasing while cecum size decreased in the omnivores? 2. How does insect respiration differ from that of vertebrate respiration? How do they manage to respire?

1. Evolution is the process of change in the characteristics of the species. The changes helps the species to adapt better in the environment. The brain size increases that helps to adapt social life and increase the thinking capacity of individual. The evolution leads to the omnivore organism that depends on both flesh and vegetables that results in decrease in cecum size.

2. The insects have less developed respiratory organs as compared with vertebrates. This have book lungs, moisture body and spiracles that connect directly to the external environment for the exchange of gases. The vertebrates have developed gills and lungs for the respiration process.