Secondary Science Teachers:
If you teach biology, you might find some good resources on these websites:

http://www.nclark.net/Biology

http://www.biologyjunction.com/ (beware of the frog sounds)

https://www.biomanbio.com/index.html 

Amoeba Sisters Youtube Channel: https://www.youtube.com/channel/UCb2GCoLSBXjmI_Qj1vk-44g

These sites are created by teachers who have generously shared their teaching materials including worksheets, PowerPoints, and weblinks. Looks like they’ve done the work for you.