Which term describes a pure substance that is made up of only one type of atom?
matter
rock
compound
element

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

~fourth largest plate ~includes parts of the indian and atlantic oceans ~subducts below the eurasian plate on the west side ~ the arabian and somali plates form boundaries with it what is the name of the tectonic plate described above? a) african plate b) eurasian plate c) north american plate d) indo- australian plate

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere