Answer:Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere.
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The Cambrian explosion was a period at the Pre-Cambrian boundary of the geologic time scale at 542 Ma. At this boundary, the fossil record shows that animals suddenly appeared in a dramatic radiation of life. A radiation is the relatively rapid development of new types of organisms that derive from a common ancestor. The Cambrian explosion is important because it marks the origination of all major animal groups called phyla.
<span>Smallest to largest is--
millimeter (0.001m)
decimeter (0.01m)
centimeter(0.1m)
meter (1m)
dekameter (10m)
hectometer (100m)
kilometer (1000m)</span>
