Manu perus rainforest ecosystems

What came first egg or chicken? and is tomato a vegetable or a fruit?

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles