How have humans caused damage and change to each of the earths spheres

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind