Lesson 1 Reading Guide - Vocab organism cell unicellular multicellular homeostasis Characteristics of Life.

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Lesson 1 Reading Guide - Vocab organism cell unicellular multicellular homeostasis Characteristics of Life

Lesson 1 All living things are organized, grow and develop, reproduce, respond, maintain certain internal conditions, and use energy. Things that have all the characteristics of life are called organisms. organisms Characteristics of Life

Lesson 1 A cell is every organism’s smallest unit of life.cell Unicellular organisms are organisms made of only one cell.Unicellular Living things that are made of two or more cells are called multicellular organisms.multicellular Organization

Lesson 1 Changes that occur in an organism during its lifetime are called development. In multicellular organisms, development happens as cells become specialized into different cell types. Some organisms have dramatic developmental changes, such as a tadpole becoming a frog. Growth and Development

Lesson 1

Reproduction is the process by which one organism makes one or more new organisms. Some organisms can reproduce by dividing and becoming two new organisms. Some organisms must have a mate to reproduce, but others can reproduce without a mate. Reproduction

Lesson 1 All living things respond to changes in the environment called stimuli. There are two types of stimuli: Internal stimuli are changes within an organism. External stimuli are changes in an organism’s environment. Responses to Stimuli

Lesson 1 An organism’s ability to maintain steady internal conditions when outside conditions change is called homeostasis. homeostasis Homeostasis

Lesson 1 Maintaining homeostasis ensures that cells and the organism can function normally and remain healthy. Homeostasis (cont.)

Lesson 1 Contractile vacuoles are cellular structures that help maintain homeostasis by pumping excess water from the cell. Homeostasis (cont.)

Lesson 1 Cells continuously use energy to transport substances, make new cells, and perform chemical reactions. For most organisms, energy for life comes from the Sun. The Sun’s energy can be passed from one organism to another. Energy

Lesson 2 Reading Guide - Vocab binomial nomenclature species genus dichotomous key cladogram Classifying Organisms

Lesson 2 There have been many different ideas about how to organize, or classify, living things. Carolus Linnaeus classified organisms into two main groups, called kingdoms, based on similar structures. Classifying Living Things

Lesson 2 The current classification method for organisms is called systematics. Systematics uses all known evidence to classify organisms, including cell type, how food and energy are obtained, structure and function of features, common ancestry, and molecular analysis. Determining Domains

Lesson 2 Organisms are now classified into one of three domains and then into one of six kingdoms. Determining Domains (cont.)

Lesson 2 Organisms are now classified into one of three domains and then into one of six kingdoms. Determining Domains (cont.)

Lesson 2 Binomial nomenclature is a system for naming organisms with two-word scientific name:Binomial nomenclature A species is a group of organisms that have similar traits and are able to produce fertile offspring.species A genus is a group of similar species.genus Scientific Names

Lesson 2 Binomial nomenclature was developed by Linnaeus and is still used today. Scientific names are important because each species has its own scientific name and those names are the same worldwide. Scientific Names (cont.)

Lesson 2

Classification Tools (cont.) A dichotomous key is a series of descriptions arranged in pairs that lead the user to the identification of an unknown organism.dichotomous key

Lesson 3 The invention of microscopes enabled people to see details of living things that could not be seen with the unaided eye. One of the first microscopes, invented by Anton van Leeuwenhoek in the late 1600s, could magnify an image about 270 times its original size. The Development of Microscopes

Lesson 3 In the early 1700s Robert Hooke used a microscope to observe and name cells for the first time. The Development of Microscopes (cont.)

Lesson 3 Types of Microscopes A compound microscope is a light microscope that uses more than one lens to enlarge images up to 1,500 times their original size.compound microscopelight microscope JGI/Getty Images