Which of the following characteristics of living things best explains why birds fly south for the winter?

The cells of multicellular organisms are

Diffusion occurs because

Which sequence correctly traces the path of a protein in the cell

Which structures carry out cell movement?

Why are fossil fuels nonrenewable?

In Rawanda, there are more young children than teenagers, and more teenagers than adults. This age structure indicates a population that

A resource, such as air or parts of the oceans, that is open to anyone is often preserved by

Several species of warblers can live in the same spruce tree ONLY because they

A mountain can affect climate by

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