Among the options given, the characteristic that is not true for fungi is: b all break down food internally.
Fungi have a unique method of obtaining nutrients. While it’s true that they break down food, they do this externally, not internally. Fungi secrete enzymes into their environment to digest organic matter outside their cells. Once the food is broken down into smaller, absorbable molecules, fungi then absorb these nutrients through their cell membranes. Therefore, option b does not accurately describe a characteristic of fungi.