HELP PLZ! Which energy source has no greenhouse gas emissions but has waste products that present a health hazard for humans?

Group of answer choices

petroleum

nuclear

coal

geothermal

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Lola needs to sign 6 invitations. using stopwatch that measures time to tenths of a second, it takes lola 5.3 seconds to sign her full name. going by the accuracy of the stopwatch, which is the most accurate determination for the number of minutes lola needs to sign all 96 invitations

What in scientific term why the salty popcorn causes this thirst