Sandford facts for kids. Dred Scott v. Stanford 60 U.S 393 (1857) was a United States Supreme Court landmark decision. In 1857 the court ruled that African Americans, whether free or slaves were not citizens of the United States
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Correct answer: Norepinephrine is a substance that is predominantly released from the ends of sympathetic nerve fibers.
Explanation:
Norepinephrine is a substance that is predominantly released from the ends of sympathetic nerve fibers and that activates the force of skeletal muscle contraction as well as the rate and force of contraction of the heart. Their actions are vital to the fight or flight response, so the body thus prepares to react or withdraw from an acute threat.
It is based on shared concepts that people define for themselves. -Apex
Answer:
Birds’ feathers are designed to be light but very strong, flexible but very tough. Although it looks like feathers grow all over a bird, they actually grow in specific areas called feather tracks. In between the feather tracks are down feathers. This keeps the body weight down.
Feathers are made of a tough and flexible material called keratin. The spine down the middle, called the shaft, is hollow. The vanes are on the two halves of the feather. They are made of thousands of branches called barbs. Because there are many spaces between these barbs, a feather has as much air as matter.
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