Living things are both similar to and different from each other and from nonliving things.

1. Compare and contrast the parts of plants, animals, and one-celled organisms.

Living things are composed of cells

Muscle Cells Cells provide structure and carry on major functions to sustain life.

Heart Muscle Cells Cells provide structure and carry on major functions to sustain life.

Red and White Blood Cells Cells provide structure and carry on major functions to sustain life.

Cells are usually microscopic in size.

cells function similarly in all living things Strep bacteria Onion plant Chimpanzee

Cells grow and divide, producing more cells. E. Coli bacteria dividing

Cells grow and divide, producing more cells. Paramecium dividing

Cells grow and divide, producing more cells.

Cells use nutrients to provide energy for the work that cells do to make the materials that a cell or an organism needs. Photosynthesis Cell Respiration

to make the materials that a cell or an organism needs. Photosynthesis

to make the materials that a cell or an organism needs. Photosynthesis

To provide energy for the work that cells do Cell Respiration

Most cells have cell membranes, genetic material, and cytoplasm.

bacterial chromosome

Some cells have a cell wall and/or chloroplasts. Elodea

Some cells have a cell wall and/or chloroplasts. Cell Wall Chloroplast

Many cells have a nucleus.

Some organisms are single cells Amoeba

Some organisms are single cells Paramecium

Some organisms are single cells Euglena

Some organisms are made up of many cells Homo sapiens

Some organisms are made up of many cells Hydra

Some organisms are made up of many cells Oak Tree

Some organisms are made up of many cells Daphnia

Cells are organized for more effective functioning in multicellular organisms.

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OrganTissueCellOrgan System

Many plants have roots, stems, leaves, and reproductive structures.

These organized groups of tissues are responsible for a plant’s life activities.

Animals have similar organs and specialized systems for carrying out major life activities. Human Cardiovascular System Pig Cardiovascular System

Living things are classified by shared characteristics on the cellular and organism level. BacteriaCells with a Nucleus

In classifying organisms, biologists consider details of internal and external structures.

Biological classification systems are arranged from general (kingdom) to specific (species).