In the development of an animal which stage comes first? Coelom development Gast
ID: 99232 • Letter: I
Question
In the development of an animal which stage comes first? Coelom development Gastrulation Cell cleavage Blastocoel development According to the "Hygiene hypothesis" a long history of co-evolution between humans and their parasites has made the human immune system _______. work better when modern hygiene eliminates exposure to human parasites vulnerable to a wide range of harmful parasitic infections sometimes become over-active if the parasites are not present almost perfect at preventing infection by the nematodes that cause ElephantiasisExplanation / Answer
3----c) cell cleavage.
Cleavage of zygote leads to 8 cell stage and again cleavage occurs that leads to blastula and then blastocoel development occurs. After blastocoel development gastrulation occurs and Coelum development begins in gastrulation stage.
4---c) sometimes become overactive if the parasites are not present.
This leads to the allergic reactions in the human immune system.