Did you guys know... In Justin Bieber’s song “yummy” he says “you make my toes curl” look up the lyrics it’s hilarious

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?