The plant cells rigid cell wall prevents it from bursting but what keeps a plant upright

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

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

9. the history of life on earth is recorded in