Breland and Breland tried to use shaping to train a pig and a raccoon to drop wooden coins into a bank. But once the animals learned an association between the coins and , they could not overcome their biological impulses.

ocean expansion, global warming is melting icebergs and causing water levels to rise.

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.