Answer:1. Why is the Kingdom Protista considered as the "odds and ends" kingdom? Because it includes organisms that do not fit into other kingdoms, showing characteristics of plants, animals, or fungi.2. Why are fungi important in ecosystems and industries? They decompose organic matter, recycle nutrients, and are used in food, medicine, and fermentation industries.3. How do plants sustain life on Earth? They produce oxygen through photosynthesis, provide food, and serve as habitat for many organisms.4. Why are animals considered essential in ecological balance? They maintain food chains, help in pollination and seed dispersal, and regulate population of other species.