Research

The dark spots on the leaves of these tomato plants are an early symptom of infection caused by the plant pathogen Pseudomonas syringae. The bacteria spread infection by water-logging the spaces between cells in the plant’s leaves, creating a moist, cozy place to feed and multiply. Credit: Goldlocki, Wikimedia Commons
This fish doesn’t rely on its eyes to tell if it got its color camouflage right -- it uses its skin.