Bivalve's are useful environmental indicator organism because most bivalves are filter feeders specially in polluted area or in a water and they filter most bacteria where polluted area is present.
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The Eurypterids in these cross sections not useful as index fossil because they are only found in certain areas are a long lived organism
The color of the organism's eyes would likely be the least useful piece of information for classifying it as an animal. Characteristics such as body structure, presence of a backbone, method of reproduction, and diet are more relevant in determining classification within the animal kingdom.
Breeding isn't useful, it is a must, without breeding there would be no food and every living organism would cease to exist.
Not necessarily. While adaptations can help an organism survive and reproduce in its environment, they may not always be beneficial in all situations or environments. Changes in the environment or interactions with other species can render an adaptation less useful or even harmful over time.
Studying bacteria and animals that use magnetic fields to navigate can provide insights into how these organisms sense and respond to environmental cues. This understanding can have applications in various fields, such as bioengineering, environmental monitoring, and navigation technology. Additionally, it can help us better understand the diversity of mechanisms organisms use to interact with their surroundings.