What is the answer to 18 and 19 please help

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

What macromolecule is produced during translation? a. carbohydrate b. rna c. dna d. protein

The negative impacts of nonnative species generally outweigh the positive impacts