Across
1.) A ridge or line of high ground forming the division between two valleys or river systems
4.) Bottom dwelling
7.) Visible with the naked eye
8.) The beginning of a stream
9.) The area in which an organism or population lives and can obtain all of its basic needs
10.) Where the stream dumps into a body of water
Down
2.) This metamorphism goes through these stages: egg, nymph, adult
3.) A biological community of interacting organisms and their physical environment
5.) The process of excess nutrients accelerating the growth of algae, ultimately depleting the water of dissolved oxygen, killing animals
6.) An organism without a backbone
8.) The land area that is drained by a river and its tributaries