Twenty questions make up an assessment designed to test super scientists' knowledge of ecosystems. Scholars answer multiple-choice and short-answer questions about organisms, food chains, energy flow, and more.

In this homonyms worksheet, students complete a 20 question multiple choice on-line interactive quiz about the correct use of homonyms in sentences.

Take an interactive quiz over plant and animal cells. After completing the quiz, check your score, and then revisit any incorrect question for further review.