The explanations are in the attached file.
1. The right answer is X.
3. The right answer is Retroviruses.
4. The right answer is Archaebacteria do not have peptidoglycan in their cell walls, but Eubacteria do.
5. The right answer is Some bacteria provide nutrients and raw materials for organisms in an ecosystem.
6. The right answer is acting as a pathogen.
7. The right answer is releasing toxins.
8. The right answer is bacteria.
9. The right answer is Protists are incredibly diverse, and the different groups probably evolved independently of each other.
10. The right answer is conjugation
11. The right answer is movement and feeding, respectively
12. The right answer is yeasts
13. The right answer is Mycelium.
14. The right answer is Are composed of chitin.
15. The right answer is It allows the organisms to live in environments where neither could live alone.
16. The right answer is mycorrhizae.
17. The right answer is autotrophic.
18. The right answer is nonvascular plants are typically smaller than vascular plants.
19. The right answer is The development of vascular tissue allowed plants to grow taller.
20. The right answer is stand upright
21. The right answer is mosses
