An experiment in which only one variable is changed is a(an) experiment.

a. randomized
b. natural
c. double blind
d. controlled

What happens when the cell copies its chromosomes

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin

50 points! which of the following is an inference? a burning candle is extinguished when it is covered with a jar. the candle burns longer than expected in a jar that has a plant in it. a plant lives longer than expected in a jar that has a burning candle. there is more oxygen in the jar because there is a plant in it.