Answer:
It is important to carefully consider the units you will use to collect data when conducting a scientific experiment. In the experiment described, "How does the color of light affect plant growth?", there are a few different options for units that you could use to collect data. Some examples of units that might be relevant for this experiment include:
Length: You could measure the length of the plants at different points during the experiment to track their growth over time.
Width: You could also measure the width of the plants, either at specific points along their stems or by measuring the diameter of the entire plant.
Height: Alternatively, you could measure the height of the plants from the soil surface to the top of the highest leaves.
Mass: You could also measure the mass of the plants, either by weighing them on a scale or by using a balance to measure their weight.