Answer:
Calcium
Explanation:
Calcium is an essential part in the strength of bones & teeth's, for it is a key component in the creation of the structures as well as the outer hardness of the two.
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If unemployment is rising rapidly, the federal reserve most likely :
Buy securities in open market operations
This way, the companies will have enough money to hire more people
hope this helps
I'm sorry, can you give more information?
Answer:
1. Cartography
2. Navigational compass
3.Photography
4. Internet
Explanation:
Cartography: is a method of designing, creating and studying geographic locations on flat surfaces like maps. This scientific method dates to some thousands of years ago. It dates to pre-historic times as far back as 2300 BCE when the Babylonians represented locations in clay tablets.
Navigational compass: is thought to have originated in the Han Dynasty in China between the 2nd century BC and the 1st century AD. Then it was used for fortune-telling and was called the "South Pointing Fish." It was adapted as a navigational compass in the Song Dynasty in the 11th century.
Photography: This originated in the 19th century precisely the late 1830's when Nicéphore Niépce captured the pewter plate exposed t light and coated with bitumen. In the later part of the century, geographers began adapting it to their work.
Internet: the inventions of computers in the 1950's came along with the internet that has been a useful resource for geographers.
