The Ministry of Civil Affairs issued a disaster report, saying that as of March 23rd, 20 10, the drought had affected 6 130 people in five provinces (regions) of Guangxi, Chongqing, Sichuan, Guizhou and Yunnan. (1) Locusts have exoskeletons, which can protect and support the soft organs in the body and reduce the loss of water in the body to adapt to the relatively dry environment on land.

(2) The development process of grasshoppers includes three stages: fertilized eggs, nymphs and adults, which are incomplete metamorphosis.

The development of silkworm goes through four stages: fertilized egg, larva, pupa and adult. The development of silkworm goes through four stages of molting, and the morphological structure and living habits of larvae and adults are obviously different. This development process is called complete transformation. Compared with silkworms, the development of locusts has fewer pupal stages.

(3) The development of mosquitoes goes through four stages: fertilized egg, larva, pupa and adult, and the morphological structure and living habits of larvae and adults are obviously different. This development process is called complete transformation.

So the answer is: (1) exoskeleton;

(2) pupae;

(3) complete metamorphosis;