Ключевые слова: animals, biodiversity, biological, biome, blackboard, chalk, chalkboard, climate, concept, continent, deforestation, desert, design, diversity, earth, eco, ecology, evolution, fauna, flora, freshwater, graphic, grassland, hand drawn, humans, icons, illustrations, international, isolated, lifestyle, marine, pack, park, protect, protection, research, save, saving, set, sign, sketch, symbol, symbols, tropic, warming, web, wild, wildlife, world,