Agel electrophoresis is performed, but when the gel imager is used, no bands appear. the researcher might have forgotten to

If a gel electrophoresis is performed, and no bands appear when the gel imager is used, then it is highly possible that the researcher might have forgotten to do one of the following:

- Add electric current.
- Add buffer solution.
- Include DNA dye.

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.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .