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people learn from plants

Why Study Plants? ... read more

what is a plant

Plants and animals are living things, or organisms. Plants make it possible for all the other living things to exist on planet Earth. While plants are similar to animals in some ways, they are unlike animals in many more ways. Plants, like animals, are made up of cells. ... read more

the universe

The universe is everything. It contains all galaxies, stars, planets, and matter that have ever existed or ever will exist. Everything you can possibly think of is part of the universe. The cosmos is another word for universe. It is impossible to imagine the size of the universe. Think of words like h... read more

what is chemistry

Chemistry is the study of substances and the changes that happen to them. Substances are things like food, clothes, and medicine. Chemistry is very important. Plastic bags and shoes with rubber soles would not exist without chemistry. Fuels for cars, airplanes, and rockets would not exist without chem... read more

the life cycle

The stages of human life are often described as a life cycle. For each individual, however, life is a straight line. Like a story, it has a beginning, middle, and an end. The earliest stage of life is a single cell. The cell divides and, with instructions from genes, forms different tissues. These tis... read more