Which of these elements must be present in order for a molecule to be considered organic?

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 type of competition exsist between two species. turtles and fish

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?