In the 1700s a scientist named Joseph Priestley discovered that when he placed a jar over a candle, the flame soon went out. However, if he placed a live plant under the jar with the candle, the flame did not go out. Use what you have learned about photosynthesis to explain Priestley's results.

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What is thought to have caused the mass extinction at the end of the cretaceous period?

How would you describe an allele that be expressed and determines an organisms appearance? a. uncapitalized b. responsive c. recessive d. dominant

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.