It is safe to cut veges and raw meat on the same cutting board without washing it t/f

Which of the following is a testable hypotheses?

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.

Why are current extinctions of concern to enviromentalists?