Not they don't each cell is individual they don't connect
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. The right atrium receives deoxygenated blood from systemic veins; the left atrium receives oxygenated blood from the pulmonary veins.
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Adaptation is evolutionary process that fits organisms to their environment, increasing their evolutionary fitness. It is in a first place, a process rather then a part of a body or a physical form.
Adaptation is one of two main processes that explain the observed diversity of species. Other process is speciation.
All adaptations help organisms survive in their environments.
The adaptive traits may be physiological, behavioural or structural.
Correct answer: B) Lipids
Lipids are that molecule, which contain hydrocarbon and is responsible for making the building blocks of the structure and function of cells.
Example of fats include waxes, oils, and vitamins such as A, D, E, and K.
The most important function of the fat inside the body is energy transformation and heat insulation.
The adipose tissue act as an insulator of the body by trapping the heat across the important organ of the body, they also provide cushioning to the organs and protect them from mechanical shock and damage.