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

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

What is a traditional chinese touch therapy involving finger pressure applied to specific areas of the body to restore the flow of qi.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?