MORE HELP PLZ Which group of organisms evolved first?
amphibians
fish
reptiles
mammals

I'm pretty sure it's fish since they evolved into both reptiles and amphibians

Explanation:

2. In the above diagram, which cycles represents lytic infection of a cell by a bacteriophage?  > X
3. Viruses containing RNA as their genetic information are called > Retroviruses.
4. In the six-kingdom classification system, bacteria are divided into two kingdoms, Eubacteria and Archaebacteria. The main difference in the cell structures of the two groups of bacteria is that > Archaebacteria do not have peptidoglycan in their cell walls, but Eubacteria do.
5. How do bacteria contribute to an ecosystem? > Some bacteria provide nutrients and raw materials for organisms in an ecosystem.
6. Which of the following roles of bacteria is not a benefit to human bodies? > acting as a pathogen
7. Two ways bacteria cause disease is by using the cells of the organism they infect as food and by > releasing toxins.
8. Antibiotics are often effective treatments for diseases caused by > bacteria.
9. What is one reason biologists have difficulty classifying protists? > Protists are incredibly diverse, and the different groups probably evolved independently of each other.
10. Ciliates can reproduce asexually using fission, but they can also exchange genetic material with one another. What is this process called? > conjugation
11. In protozoans, for what are the structures called cilia and pseudopods used? > movement and feeding, respectively
12. Which member of the kingdom Fungi is not multicellular? > yeasts
13. The tangled mass that makes up the body of a fungus is the > Mycelium.
14. The cell walls of fungi differ from those of plants and protists because the cell walls of fungi > Are composed of chitin.
15. How does symbiosis benefit the organisms that make up a lichen? > It allows the organisms to live in environments where neither could live alone.
16. Plant roots can gain important materials through symbiotic relationships with fungi. What are these associations called? > mycorrhizae
17. With rare exceptions, which of the following characteristics do plants share? > autotrophic
18. Which statement describes the sizes of nonvascular and vascular plants? > Nonvascular plants are typically smaller than vascular plants.
19. What effect did the development of vascular tissue have on plant evolution? > The development of vascular tissue allowed plants to grow taller.
20. The chemical lignin hardens plants' cell walls. What does this allow plants to do? > stand upright
21. Which group of plants evolved first? > mosses