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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Interactive lesson plan (Salt water food chain)
The following is a weblink to the site we found on food chain;
http://www.secretsatsea.org/story/1a.html
Click on it and have some fun learning about food chain in the ocean.
The website is very colorful and actually presents the lesson in form of a investigative assignment where students will act as detectives looking for culprits who dump hazardous wastes into the ocean.