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Which germ layer in mammals is predominantly responsible for forming the nervous system?

Ectoderm

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What kind of microscopy does the following describe: Samples are treated with an electron-dense material and then cut into thin layers. While inside the microscopes column, electrons that are passed through the sample and differentially scattered to show a silhouetted image on a phosphorescent screen:	What is the most common physiological term used to denote how the body maintains a stable internal environment in the face of a constantly changing external environment?