You have just met a fellow student who has several tattoos and a nose ring. you quickly ‘size him up' based on his features and assume he must be an art major. what kind of cognitive bias is this?

you should try adrenaline. it kicks in in situations like this.

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d