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Lesson 1 Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

3.1 Classifying by structure All plants need to move water and nutrients from the ground to their cells. Plants with roots, stems,and leaves have a system of tubes for this. Mosses and other plants...

Scientists divide the animal kingdom intotwo main groups: animals with backbones and animals without backbones. 4.1 Vertebrates – Animals with BackbonesAnimals with backbonesare called vertebrates. Vertebrates are dividedinto five classes—fish, amphibians, reptiles, birds,and mammals....

Animals inherit characteristics from their parents. These specialphysical features and behaviors help them survive. The same way human children often have the same hair color as their parents, young animals inherit traits fromtheir parents....

5.1 Plant cells All plants are made of cells. Plants may lookdifferent, but they have many of the same kindsof cells. The cells are organized into tissues, andtissues are organized into organs. Each plant...

A plant has different parts. Each part playsa role in helping the plant survive in its environment. 6.1 The role of roots Roots take up water and nutrientsfrom the ground. They also keepplants firmly...

Grasses, trees, and other seed plants grow fromseeds. A seed is a plant that is not fully formed.The coating of a seed protects the plant inside.There are about 250,000 species of seed plants.How could...

Like animals, plants have a life cycle. Whether a plant growsfrom a seed or a spore, it goes through several stages of growth.Plants, unlike animals, continue to grow as long as they live.Life Cycle...

Seeds grow into plants that look similar to their parentplants. For example, all foxglove plants have tall stemsand flowers shaped like trumpets. However, offspringplants are not an exact copy of their parents. The colorof...

An ecosystem is made of living and nonliving parts that all worktogether. Every organism in an ecosystem has a part to play. An ecosystem is all theliving and nonliving things in an environment and...