Which chemical is the building block of amino acids and proteins?

oxygen
carbon
nitrogen
hydrogen

Which metals are called noble metals

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.

What volume of argon gas is equal to 1.60 grams of argon