NESESITO UNA LLUVIA DE IDEAS PORFA El sistema circulatorio humano
En los organismos multicelulares, los nutrientes al
igual que los desechos celulares, deben recorrer
ciertas distancias, ya que están siendo asimilados y
producidos por órganos especializados que están
lejos. En consecuencia, el oxígeno viaja desde los
pulmones, encargados del intercambio gaseoso,
hasta las células. El dióxido de carbono por su
parte, recorre el camino inverso, es decir, sale de las
células para ser eliminado por los pulmones.
Para que este recorrido sea posible, una serie de
estructuras se han ido especializando para dar lugar
al sistema circulatorio, el cual transporta sustancias
como nutrientes, hormonas, gases y desechos. Estas
sustancias son llevadas y disueltas en la sangre que
es impulsada por el corazón. En este recorrido, el
sistema circulatorio recibe los nutrientes del aparato
digestivo y el oxígeno de los pulmones, recoge los
desechos metabólicos de las células como el CO2
y la úrea, y los deposita en el sistema respiratorio y
excretor para ser eliminados

The answer should be geothermal i hope i’m right message me if i’m wrong and i’ll change my answer and fix it for you

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.