The precambrian era makes up about 90% of the earths history, but there was little to no living organisms at the time other than microscopic ones. The first eukaryotes were found in the cambrian period after the precambrian period, not only that but at the end of the precambrian era in the Proterozoic era there was a mass extinction of about 70-80% of all living organisms
the answer for number 12 is 1.00 g/mL
They both work by being an immune system
There different places so when the earth is spinning around the sun it doesn't hit everything <span />
