1. la principal función del sistema respiratorio es llevar oxígeno a través de los vasos sanguineos.

¿falso o verdadero?​

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Identify the missing parts of the carbon cycle

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.