A biology student is studying ground squirrels in a local park. She has captured, measured, and released many ground squirrels f
rom an upland, rocky, wooded area, and many similar ground squirrels from a shrub area in soft soil near a stream. She is measuring skull dimensions, leg and claw lengths and shapes, and other traits of the ground squirrels from each collection area. She is involved in _________.
Either, carbon, hydrogen, nitrogen, oxygen, phosphorus, or sulfur. I would go with carbon because of the photosynthesis and cellular respiration<span />
