OS GLOBULOS ROJOS: Si se observa en el microscopio una gota de sangre, se ve que en ella nada una multitud enorme de corpúsculos pequeñísimos de color rojo, que son los que le dan ese color. Son los glóbulos rojos de forma circular aplanada, hundida en su parte central. En todas las personas, los glóbulos rojos son de dimensiones aproximadamente iguales, de 0,007 mm de diámetro y de 0,002 mm de grosor. Pero su numero es fantástico. Una gotita pequeñísima de sangre, de 1 mm^3, contiene 5 millones de estos corpúsculos. Además, en el cuerpo humano hay un numero de litros de sangre 14 veces menor que el numero de kilogramos que pesa la persona. *

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

answer; i believe the correct answer to the above question is ( friction)

wait any answer choices plz