Sarah should found a Gills when she observes closely and dissecting the organism. A gills is what species in the water use for breathing, when people or human have lungs to breathe, fish or underwater species use gills to breathe in water. It is a respiratory organs of animals especially fish.
Below 0°C (273.15K, 32°F)
because a cold is a virus and not a bacteria.
Answer:
mutation, recombination, and immigration of genes.
