Particle clouds from where stars are formed are known as____________?

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Density of Ice is_________?

A. 800kg/m3 B. 917kg/m3 C. 930kg/m3 D. 1000kg/m3...

Which term describes the emission of light by a living organism?

A. Natural light B. Bioluminescence C. Illumination D. Mimicry...

The gases which are used by drivers as an artificial atmosphere are helium and_____________?

A. Nitrogen B. Oxygen  C. Neon D. Carbon monoxide...

Which gas is commonly used in ballons and airship a Helium [B] Hydrogen c Carbon d NOT

...

What charge card, developed in 1950, was the first to be accepted nationally in the US?

A. Visa B. Discover C. MasterCharge D. Diner’s Club...