Answer:
weak acid
Explanation:
4-6.9 belongs to weak acids
Number 3 and 4 are the correct answers hope this helped
Answer - They take in C02 (Carbon Dioxide) & Release O2 (Oxygen)
Reasoning - To be able to do Photosynthesis they Plants need C02 which is one of the important components to making Glucose. During that gas exchange they release O2 for C02.