When the rock layers at outcrops A, B, C, and D are correlated, which rock layer would be determined to be the oldest? gneiss quartzite marble sandstone

What two fields of study provide the core information that is used to classify organisms?

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?