The answer could possibly be natural selection or survival of the fittest
The building blocks of lipids are one glycerol molecule and at least one fatty acid, with a maximum of three fatty acids.
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Cell
Tissue
Organ
Organ system
Organism
Brain, spinal cord, nerves
The brain controls thought, behavior, emotion, memory, and basic life functions. The brain is also the origin of control over body movement. The spinal cord connects the peripheral nervous system (PNS) to the brain; nerve impulses reaching the spinal cord through sensory neurons are transmitted up into the brain. Nerves primarily involve control and coordination of all parts of the body.
The nervous system interacts with every other organ system. For example the hypothalamus in the brain controls the pituitary gland and tells it when to produce hormones, this shows that the nervous system interacts with the endocrine system.
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Alfred Wegener, is who proposed the idea of Pangaia
Elephants are herbivores because their diet consists mainly of plants and leafy greens. Herbivores only eat plants therefore elephants are herbivores.