Cells and Systems Unit B PDF

Cells and Systems Unit B Lesson 1: Characteristics of Living Things! Scientists agree that there are six characteristics of living things: ✔ Organization - Living organisms are made of cells ✔ Energy - Living organisms need energy ✔ Environment - Living organisms respond and adapt to their envir...

Cells and Systems Unit B Lesson 1: Characteristics of Living Things! Scientists agree that there are six characteristics of living things: ✔ Organization - Living organisms are made of cells ✔ Energy - Living organisms need energy ✔ Environment - Living organisms respond and adapt to their environment ✔ Reproduction - Living organisms reproduce ✔ Growth - Living organisms grow and develop Cells ORGANIZATION: WITH CELLS ✔ The cell is the basic unit of life. ✔ It can perform all the processes that allow life to happen. ✔ All organisms are made up of at least one cell and every cell comes from another cell. ✔ Cells make tissues→tissues make organs→ organs make body systems→ body systems make a whole organism! Energy ✔ Energy is the ability to make things move and change. ✔ Everything that an organism does needs energy. ✔ Energy is obtained from the environment. Plants and animals differ in how they obtain their energy. ✔ Plants use the energy of the sun to make their own food, whereas animals get their food from the environment around them. ✔ Nutrients are substances that provide the energy and materials that organisms need to grow, develop, and reproduce. ✔ All of the processes that occur inside the organism to sustain its life are called the organism’s metabolism. Responding To The Environment ✔ A stimulus is anything that causes a response in an organism. The organism’s reaction to this stimulus is called a response. Growth and Development ✔ Organisms have the ability to replace some cells that are worn out or damaged. As organisms grow and develop their body size and shape can change. This is called development. Reproduction ✔ All living things come from other living things. ✔ Reproduction is not necessary for the organism to survive (because it will eventually die), but it is necessary for the species to survive. Adaptations ✔ An adaptation is a characteristic that allows an organism to survive in its environment. Organisms adapt to their environment for survival. ✔ There are two types of adaptations: ✔ structural – in which organisms have a structural feature that is a part of them that enables them to adapt ✔ behavioral – is an action the organism does to survive Classwork Check Answer questions 1-4 on page 88 of the Science in Action 8 textbook