Digamos que es necesario transportar un líquido (la sangre) de una parte del cuerpo a otra sin liqueos. Como la distancia que el líquido tiene que viajar es grande, necesitamos algún tipo de bombeo en el camino. ¿Cómo armarías este sistema? Piensa, construye algo simple haciendo uso de los tejidos fundamentales y compártelo en este foro. Evalúa lo que al menos dos colegas pongan en el foro.

How is an environment able to support different varieties of organisms?

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.