Look carefully at the above image. What do you see? What colors? What shapes? Can you guess what it is?
These are actually cells from a mouse's kidney. Cells are the smallest units of living things. You are made of cells. Plants are made of cells. So are mice, chickens, bees, and mushrooms. Our cells even look very similar to the above mouse cells.
But the cells of a kidney are not actually bright green, red, and blue. Scientists remove cells from organisms, dye them with different colors, and look at them under strong microscopes. The above image is an example of what scientists see under these microscopes. Now, we will explore what different types of cells look like and what they do.
Sims-Lucas S, Schaefer C, Bushnell D, Ho J, Logar A, et al. www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0065993. CC BY 2.5.