<span>The second statement is correct. Viruses can infect all cellular life forms, but each cellular species
can be infected by own limited specific range of viruses. Most viruses that harm
animals can not harm humans. But, some viruses can infect different species of mammals, for example both
bats and humans can be infected be rabies.</span>
Energy is lost as you go up the trophic levels. Therefore the trophic level with the least amount of energy is the secondary consumers.
Note: I'm not sure where decomposers fall in the food chain. I did not say decomposers as they are and can be present in any trophic level.
