If many animals feed at more than one trophic level, then what feeds at more than one trophic level? Answer choices: - hunger - animals - crocodiles - humans - alpacas - ducks - grains - plants
animals

If influenza is a disease caused by a virus, then what is influenza caused by? Answer choices: - insects - A bacteria - smoking - Mold - Viruses - amoeba - Cold weather - chemicals
Viruses

If nitrogenous wastes are excreted in urine, then how are nitrogenous wastes excreted? Answer choices: - solutes - wetland - salmon - urine - soil - harmful - gills - CO 2
urine

If light is required for seeing, then what is required for seeing? Answer choices: - dark - sun - light - wind - retina - eyes - photons - copper
light