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He noticed that there were different species of finches.
The main geological feature of the Galapagos Island is volcanic material. Just like many islands, the Galapagos Island is made from an old volcano and tectonic plates.
Adaptations
The Galapagos Islands are popular tourist destinations, so many travel agencies feature Galapagos travel packages. Some places to try include Friendly Planet, Tours4Fun, and Virgin Vacations.
Darwin noticed that the finches in the Galapagos Islands had different types of beaks. He concluded that this meant they must have evolved these beaks, so that each type could find food.
The adaptations that euglena have helps it to survive in its habitant. One such feature is the flagellum which is similar to a tail and helps it in movement.
An Adaptation. Adaptations are used to survive.
The observation that Darwin made for the species on Galapagos Island is that they adopt the feature according to the habitat they are living in. You can get more info on naturegalapagos.com
A characteristic is a feature that has different forms in a population
Adaptation is also a common term to describe these helpful or adaptive traits. In other words, an adaptation is a feature of an organism that enables it to live in a particular habitat.Most species of earthworms share some common traits or adaptations, such as their streamlined body shape. However, different species of earthworms have adapted to different habitats and occupy different nicheswithin the ecosystem. As a result, earthworm adaptations are many and varied. In all animals, types of adaptations can be grouped into three main categories: structural, physiological and behavioural.
The River Nile
This is 'convergent evolution', where completely different, unrelated organisms develop a similar feature.