This model shows a human embryo. What can you determine about its development from the model? It has a postanal tail.
It’s a vertebrate
It has pharyngeal arches.
It has fully developed organ systems.

it has a postanal tail

Explanation:

i did this a couple days ago and i got it right, it might be wrong tho, if it is I forgot. but hope it's right.

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.