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11. Match the numbers in this mathematical expression with the number of significant digits they have.
18.34 cm + 9.02603 cm
20.2 cm + 150 cm
1. 18.34 cm
a. 4
b. 6
2. 150 cm
c.3
3. 9.02603 cm
d. 2
4 20.2 cm
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Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

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