6 marker graph questions!!! XBI11

hello everyone i do edexcel IAL biology unit 1. im really struggling on answering questions similar to the one attached (October 2021 Edexcel IAL Biology Unit 1 - QUESTION 7)

any advice or tips are appreciated!!!

https://preview.redd.it/xq14u59ycpsf1.png?width=746&format=png&auto=webp&s=b1605758d671e2444cac9879ec1eed88102a4736

https://preview.redd.it/kwh3x7d0dpsf1.png?width=712&format=png&auto=webp&s=2e7d7b14ce34ceeedec4dc139e48da1cd2b1bed1