Some beetles and flies have antler-like structures on their heads, much like male deer do. the existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of a synapomorphy parsimony homology convergent evolution

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.

i think its through the fallopian tube