Compressibility is a chemical property because it’s made more compact
Breathing is an automatic and rhythmic act produced by networks of neurons in the hindbrain (the pons and medulla). The neural networks direct muscles that form the walls of the thorax and abdomen and produce pressure gradients that move air into and out of the lungs.
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Mutualism is seen as a positive or helpful interaction.
An example is when an oxpecker eats the bugs off a buffalo.
Mutualism is a relationship between organisms in which both benefit.