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The Brain
The answer is Sensation.
Sense organs send information to the brain via afferent pathways of the PNS (peripheral nervous system).
Sensation and perception are both processes that involve gathering information from the environment through our sensory organs. Sensation refers to the initial process of detecting stimuli, while perception involves interpreting and making sense of that information. Both processes work together to create our overall experience of the world around us.
They possess lungs to obtain oxygen from air. Their sensory organs are adapted for smelling, hearing, generally sensing on land. The reptile egg, containing everything an embryo needs and covered by a protective shell, allows it to survive in hot and dry environment.
presence of many capillaries
Dolphins have adapted to the marine environment like fish. However, anatomical (though some of their structures have become degraded or completely eliminated) characters resemble that of a mammal's. For example they have reproductive organs similar to that of mammals and they are viviparous
the lungs and the heart
Sense Organs
Those body parts are examples of sensory organs. They are responsible for receiving and processing information from the external environment to help us perceive and understand the world around us.
Special sensory neurons in sense organs that receive stimuli from the external environment.
Most sense organs are adapted for survival. While some animals are blind, like bats, they use their sense of hearing as survival. For what an animal lacks, they adapt to another sense organ to help in survival and reproduction which helps continue the species.