REET · Living and Non-Living Organisms · Quiz
5 real REET questions on Living and Non-Living Organisms. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.
Question 1 of 4
HARDIn a classification activity, students group organisms based on the presence or absence of a backbone. Organisms with a backbone are placed in Group X and those without a backbone in Group Y. A student then finds that Group Y contains approximately 95% of all animal species. Which of the following statements correctly explains this observation?