Crystalline lens
it focuses light waves on the retina
Answer:
mining
Explanation:
Once a mineral deposit has been found it has to be extracted from the ground to access the valuable minerals it contains. This can be done by opencast quarrying or underground mining. Certain minerals can also be extracted by pumping.
British East India Tea Company
The transfer goods between new and old worlds during the 1500's was called the Columbian Exchange.