I think the cause of the illness is Rota-virus. Its a contagious virus that can cause gastroenteritis(inflammation of the stomach and intestines|). Symptoms include severe watery diarrhea, vomiting, fever and abdominal pains. Infants and young children are most likely to get rota virus disease, they become severely dehydrated and can even die.
I don't know I'm just doing this because it's not letting me continue
It is called a biomass pyramid, it is the total amount of
living tissue at each trophic level in an ecosystem can be shown in a biomass
pyramid. There are three types of ecological pyramids they are pyramids of
energy, pyramids of biomass, and pyramids of numbers.