The Earth is the only planet in the Solar System on which life has been found. The Earth provides perfect conditions for hosting life:
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The oldest remains of life ever found date back 3600 million years. The origin of life on Earth is one of the most important scientific issues. There are several theories regarding the origins of life:
Molecules accumulated in primitive seas and evolved until they formed simple unicellular organisms. These organisms continued to evolve and diversify until they became the living things we find on Earth today.
During this process, living things changed the characteristics and composition of the atmosphere.
Although there is a great diversity of living things on our planet, they all share certain characteristics:
The matter which all living things consist of is organised into a structure. This structure has various organisational levels of increasing complexity.
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Activity 1
Look at these levels of organisation. Which ones are common to both living things and non-living things?
Activity 2
Look up information about the Solar System, then mark whether the following sentences explaining why there can be life on Venus are true or false:
Activity 3
3. Listen and say whether these sentences are true or false. Correct the false sentences.
Activity 4
Write three characteristics that differentiate a rock from a living thing.
Activity 5
Match the follwong words to their definitions:
