1. what happened to the bacteria's penicillin resistance from 1987 to 1990? 2. make a model to show the changes in resistant traits in the population of bacteria over time as they were exposed to antibiotics

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Which direction does the energy flow in this energy pyramid ?

What drives an advertising campaign?

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes