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Chapter 2, Section 1

Chapter 2, Section 1. Six Characteristics of Living Things. They have cells They sense and respond to change They reproduce. They have DNA They use energy They grow and develop. Cells. All living things are composed of one or more cells

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Chapter 2, Section 1

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  1. Chapter 2, Section 1

  2. Six Characteristics of Living Things • They have cells • They sense and respond to change • They reproduce • They have DNA • They use energy • They grow and develop

  3. Cells • All living things are composed of one or more cells • Cell: the smallest functional and structural unit of all living organisms • Has a membrane that separates it from the environment • Too small to see with the naked eye

  4. Sense and Response to Change • Stimulus – anything that causes a reaction or change in an organism or any part of an organism • Some examples of stimuli: • Chemicals • Gravity • Light • Sounds • Hunger

  5. Sense and Response to Change continued… • Eventhough an organisms environment may change the conditions in an organism have to stay the same this is called homeostasis. • Homeostasis – the maintenance of a stable internal environment

  6. Discussion Time!! What happens when you go outside and the air is cold?

  7. All living things have to REPRODUCE • Asexual Reproduction • Single parent • Identical offspring • Most single-celled organisms reproduce in this manner • Sexual Reproduction • Two parents • Offspring shares characteristics of both parents • Most animals and plants reproduce this way

  8. DNA! • DNA – deoxyribonucleic acid • Parents pass DNA to offspring • Heredity: the passing of genetic traits from parent to offspring

  9. Living things use ENERGY • Living things use energy to make food, break down the food and move materials in and out of the cells and/or the body. • Metabolism: the sum of all the chemical activities that the organism performs

  10. Living Things Grow and Develop Multiple-celled organisms Ex. Plants, humans When it grows the cells grow and get larger and the organism grows as well. Single-Celled organisms • Ex. Bacteria • When it grows the cells get larger and split and create more single celled organisms

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