Answer:
Some invent in order to meet basic human needs
Answer:
B or D
Explanation:
think of it how you use chalk on a chalk board, its less friction using chalk instead lets say a marker on a white board.
It is important for scientists to use scientific names and not common names because common names can be easily misunderstood as something else. For example, a scientist during an expeirement will use scientific names because if they used a common name of a certain thing and it be mistaken for something that it wasn't the entire expeirement would be ruined or someone could get hurt.
In a free market system, price controls can include both floors and ceilings.
The government imposes these limitations in order to regulate the retail value of specific goods and services. Rather than have limits on both sides, most items have either a floor or a ceiling imposed on them.
Answer:
Magnification is the ratio of <u>enlargement and reduction</u> of an image
Explanation:
Magnification is the way of enlarging the apparent size of an object. When the magnification of an object is less than 1 it shows reduction in size while when it is greater than 1, it shows enlargement in size. Mathematically, it is given by :
i.e. 
Hence, the correct option is (c) " both a and b " i.e. " enlargement and reduction ".
