21. on first attachment is secondary succession
22. is the degree of variation of life....
genetic, species or ecosystem within a specific area, system or planet
23. the last one is wrong = )
Answer:
Explanation:
Proteins are important because they give you ability to fix broken bone or to grow.
You get to eat food when u are eating that’s the purpose
Tissues form organ and organ forms organ systems,then it’s a complete organism
