Question

fiona wants to use the scientific method to answer the question \do oxygen levels in the air affect rates of photosynthesis?\ she reads about photosynthesis in her biology book and is ready to carry out the next step. what should she do next?
perform an experiment
design a procedure
make observations
form a hypothesis

Explanation:

The scientific method steps typically involve asking a question, doing background research, forming a hypothesis, designing an experiment, performing the experiment, making observations, analyzing data, and drawing conclusions. After reading about photosynthesis (background research), the next step is to form a hypothesis. The option "form a hypothesis" is the correct next step as it follows background research in the scientific method.

Answer:

form a hypothesis