Viruses that infect bacterial cells do not infect human cells and viruses that infect human cells do not infect bacterial cells. explain why this should be the case

This is because viruses bind to specific receptors on the host cell. For example, bacteriophages-viruses that infect bacterial cells, attach to receptors on the surface of bacteria, such as lipopolysaccharides or teichoic acids. Receptors determine the viruses host.

Viruses infect all types of cellular life, but often are specific for the species, so we differ human, animal, plant and bacterial viruses. Viruses that infect plants are harmless to animals and vice versa.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.