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

Rank the three variables in terms of how strongly they affect the "species" composition of the bacterial communities. place the variable with the weakest effect on the left and the variable with the strongest effect on the right.

Types of scientific inquiry that biologist engage in that cannot be completely controlled

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic