Why is a switch used in an electric circuit?
a. it is used to increase the power.
b. it is used to open and close the circuit.
c. it is used to decrease the magnetism.

Nucleic acid certain protein cell membranes certain carbohydrates

What are some characteristics of a free enterprise economy?

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.