Symbiosis can vary between mutualism, parasitism, and commensalism, tho these grade into each other, it is often difficult to tell which is involved in a given relationship.
Because a chemical change occurred. heating, baking, cooking are can cause chemical changes. color change most frequently represents a chemical change
Sea lions are noisier, seals are generally quieter, seals lack external ears, while sea lions have small flaps for ears.
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Rocks break down as they interact with air and weather - Weathering
Density differences and other factors cause metals to concentrate in igneous rocks - volcanic activity
Seawater heats up from contact with hot rock, metals dissolves in it, the water rises and contacts cooler water, causing metals ores to settle on the ocean floor - hydro thermal energy
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