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Requirements for sustaining life

water Favourable temperatures soil

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At the end of the lesson the learners will be able to: name the 5 basic requirements for sustaining life explain why each requirement is necessary for sustaining life give examples of how living things have adapted to their environment

Learning Objeåives

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Imagine that you are the design team for the first International Moon Space Station, similar to the International Space Station already orbiting Earth, but situated on the Moon!

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ANSWER THE FOLLOWING QUESTIONS What do you think the astronauts and plants living on the new Moon Station will need in order to live? Discuss the five most important requirements that you need to provide in order for the astronauts and plants to remain alive on your Moon Space Station. Explain why your group chose these five requirements as the most important to sustain life.

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Living organisms require the following to survive: 1. E nergy To stay alive and carry out biological activities, all living beings require energy. To photosynthesise, plants require energy from the sun. The food that other species eat provides them with energy.

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GASES 1. The atmosphere is the blanket of gases around the Earth. 2. Two of the gases in the atmosphere that are important for life are carbon dioxide (CO2) and oxygen (O2). 3. Plants use carbon dioxide for photosynthesis. 4. All living things need oxygen to breathe.

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WATER 1. All life processes need water in some way. 2. Plants get water from the soil. 3. The average adult body is made up of about 60% water.

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SOIL 1. Plants need soil to grow in. 2. Some animals live in soil.

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FAVOURABLE TEMPERATURES 1. The temperatures on Earth range from -50°C to 50°C. 2. This is a suitable range of temperatures for a whole range of living organisms.

Average Ground Water Temperature Across The USA 37 F 42 F 47 F 57 F 67 F

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ANSWER THE FOLLOWING QUESTIONS? What do we, as humans, need to live? 2. Name the three main gases that air is made up of? 3. Where does Earth get its energy from? (Possible aanswers : the sun)

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After the answers, the explanation should continue whereby the teacher tells the learners that in order for life to continue on earth, there are 5 things that need to be in place. All living things get what they need to stay alive from the environment that they live in which is: • The first thing that living things need from the environment is energy. • The Earth gets energy from the Sun. • Plants use this energy to make food in their leaves. This process is called photosynthesis. • Animals get their energy by eating the plants or by eating other animals. • All living things need air to survive. • Earth is surrounded by a blanket of gases called the atmosphere. This blanket of gases is made up of nitrogen, oxygen, carbon dioxide and other gases. Nitrogen makes up the largest part of air. We will learn about its importance later.

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ADAPTION TO THE ENVIRONMENT WILL BE DISCUSSED. • Living organisms are suited in different ways to the environment in which they live. We thereforesay they are adapted to their environment. These adaptations can take many forms. Some examples are: - Fish have fins that allow them to move easily through water. - Polar bears have thick fur to keep warm. - Giraffes have long necks to reach the leaves on the tops of trees.

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