Students watch a YouTube video on symbiotic relationships.Students answer questions to reinforce key concepts: what is symbiosis, how do living things benefit and harm each other, interdependent relationships in an ecosystem, and factors that affect the balance of an ecosystem. Key vocabulary are reviewed, including symbiosis, mutualism, commensalism, parasitism, seed dispersal, evolutionary fitness, evolution, survival, reproduction).This Google Form can be shared through Google Classroom. Or,