Magnesium and oxygen combine to form a new substance magnesium oxide which is a

it's answer is compound

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The answer would be compound.

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there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls