Celia wanted to know which light conditions are the best for tomato plants to germinate. Using the same bag of potting soil, she placed tomato seeds in
the dark, near a sunny window, and directly under a sun lamp. She watered
each plant the same amount every day. Identify the control variables.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

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