Which of these events did not take place in the Precambrian era? a) Continents solidified
b) Intense volcanic activity occurred
c) The first green plants grew in the sea
d) Thick bacterial films began to grow on rocks outside the ocean

The offspring will be blood type aa, bb, ab and oo or i

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water