Is there a picture fo dis question
Answer:
Retina
Explanation:
they are special type of cells in the eye that picks up photons and then signals the brain. There are to types rods and cones
Considering the definition of percentage by mass, the sample of pure lithium nitrate contains 7.99% lithium by mass.
<h3>Definition of percentage by mass</h3>
The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

<h3>This case</h3>
Because percent by mass indicates the ratio of solute to solution based on mass, if the sample has twice the mass of the first sample, the ratio remains constant.
So the percentage by mass is the same.
That is, the sample of pure lithium nitrate contains 7.99% lithium by mass.
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Learn more about percent by mass:
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The main component and key to success to Reaganomics was reduction in government spending.
<h3>What is Reaganomics?</h3>
This is the term that is used to refer to the government and the economic policies of Ronald Reagan. The purpose of the policy was to help to stimulate the United States government. The policy was contractionary in nature.
He advocated for a reduction in the way that government spent money, reduced taxes and also for less government regulations in businesses.
The result of this policy was that he helped to ensure that poverty was reduced in the country. Although it raised the levels of income inequality also in the nation.
Economics have stated that the policies of this president helped the nation to achieve great long time economic expansion.
Read more on Reaganomics here
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