Time conversions are also ratios. The ratio of time measured in minutes to time measured in seconds is one to sixty (1:60), as there are sixty seconds in a minute.

## Example 2

Adam's grandfather ran a mile in
Author(s): The Open University

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Grateful acknowledgement is made to the following sources for permission to reproduce material in this course:

Cou
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By comparing the extensive protein databases, it is possible to identify many thousands of conserved domains. For example, within eukaryotes, over 600 domains have been identified with functions related to nuclear, extracellular and signalling proteins. The majority of conserved domains are evolutionarily ancient, with less than 10% being unique to vertebrates.

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We have covered a wide range of aspects of thinking, particularly those concerned with clear and critical thinking. At this stage, you may find it useful to consider how ideas like these can be put together in ways that will help you when you engage in activities such as reading, writing, speaking and listening. Here is a checklist to use when making judgements about things that you hear, see and experience.

• Who is speaking or writing?

• W
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