How do estuaries protect and keep humans safe? They are an ecosystem full of plants that provide hiding areas for young organisms.
They are an ecosystem full of oxygen and carbon dioxide gases.
They are an ecosystem full of nutrients and biodiversity.
They are an ecosystem full of sand and plants that reduce floods, wind, and wave impact.

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b) charles darwin i learned that last year!

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )