Animals likes the sun's energy. The sun supplies energy to plants to help them grow for animals. Animals eat the plants to get the energy they need.
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The three observations that could help an individual in distinguising whether the organism is a fish or not is that it should live under water as fish can't survive without water, another thing is that it should laid eggs when it comes to giving birth because when it does not lay eggs but produces a living organism normally without an egg, it is considered to be a mammal and lastly, the appearance it possess such as having gils or fins.
A biome is a large community of plants and animals that is in a area with a distinct region. There are 5 major types of biomes worldwide. These are aquatic, desert, forest, grassland, and tundra. Hope this answers the question. Have a nice day.