Hola! tengo una pregunta ¿todos los animales invertebrados tienen un solo orificio por el que ingresa el alimento y salen los desechos? Necesito la respuesta rapido

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?