(c) If a scientist wished to determine the effect of a certain herbicide on weed
growth she would include a control in the
investigation. Suggest a suitable control in
this case.

Please help me it will be appreciated!

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

How does an angiosperm prevent self pollination

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder