Plants Animals 32 Botany 27 Juvenile literature 23 Science 13 Plants, Useful 12 Zombies 12 Medicinal plants 11 Dissertations 9 Flowers 9 Dissertations, Academic 8 Trees 7 Children's questions and answers 6 Comic books, strips, etc 6 Development 6 Reproduction 6 Identification 5 Miscellanea 5 Pictorial works 5 Growth (Plants) 4 Nature 4 Pruning 4 Training 4 Adaptation (Biology) 3 Dinosaurs 3 Earth 3 Experiments 3 Fertilizers 3 Fruit 3 Growth 3