Two scientist discussing their beliefs about something they cannot observe what do we call this ?

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

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?