In essence, the argument about intermediate forms runs as follows. If whales evolved from a terrestrial ancestor through the accumulation of small differences over time, we should expect to find the fossils of a number of â€˜missing linksâ€™, i.e. creatures with a mixture of terrestrial and aquatic characteristics. In fact, we might expect to find a succession of such animals, each a little bit more whale-like and a little bit less well adapted to life on land than its predecessor.

To m
Author(s): The Open University

Here you have the opportunity of viewing seven video sequences which show both reactions and properties of some chemical elements. The seven sequences provide examples of the way in which Periodic Tables such as Figures 17 or Author(s): The Open University

When we try to use ordinary language to explore mathematics, the words involved may not have a precise meaning, or may have more than one meaning. Many words have meanings that evolve as people adapt their understanding of them to accord with new experiences and new ideas. At any given time, one person's interpretation of language may differ from another person's interpretation, and this can lead to misunderstandings and confusion.

In mathematics we try to avoid these difficulties by ex
Author(s): The Open University

The main teaching text of this unit is provided in the workbook below. The answers to the exercises that you'll find throughout the workbook are given in the answer book. You can access it by clicking on the link under the workbook.

Click 'View document' to open the workbook (PDF, 0.4 MB).

After studying this unit you should be able to:

• understand and use the basic terms for the description of the motion of particles: position, velocity and acceleration;

• understand, use and differentiate vector functions;

• understand the fundamental laws of Newtonian mechanics;

• solve mechanics problems in one dimension by drawing a sketch, choosing a suitable x-axis and origin, drawing a force diagram, applying Newtonâ€™s second law, tak
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## Exercise 1

A vector a has magnitude |a|Â =Â 7 and direction Î¸Â =Â âˆ’70Â°. Calculate the component form of a, giving the components correct to two decimal places.

<
Author(s): The Open University

Before searching it is always a good idea to check what the source you have chosen covers to make sure it will unearth information that matches your search need (you will notice that all the resources weâ€™ve covered in this guide have short descriptions to enable you to decide which to use). Some of the decision makers, depending on the context of your search might be:

• Does it have full text?

• Does it cover the right subject?

Author(s): The Open University

Whatever resource you choose to use to find information on the internet, many of the same principles apply. Each source that you use will probably look quite different from the one you tried before, but you'll notice that there are always features that are similar â€“ a box to type your search terms in, for instance, or a clickable help button. Different resources refer to the same functions using different terminology, but the principles behind them are exactly the same. The trick is to chec
Author(s): The Open University

One of the most striking images in the IPCC TAR is reproduced (in adapted form) in Figure 24. Together, these two temperature records tell a compelling story, crystallised in our earlier quotes from the SPM. So let's just pause to take a closer look at each of them.

Author(s): The Open University

## Question 5

Capra, F. (1996) The Web of Life. Used by permission of Doubleday, a division of Random House, Inc., and, in the UK, reprinted by permission of HarperCollins Publishers Ltd.
Capra, F. (2002) The Hidden Connections: Integrating the Biological, Cognitive, and Social Dimension of Life into a Science of Sustainability. Used by permission of Doubleday, a division of Random House, Inc., and, in the UK, reprin
Author(s): The Open University

On this view, market responsibility looks something like this: if left alone, foreign companies will do what they do best, which is to spot an opportunity in the global marketplace, take advantage of it, and then try to keep the spoils of globalisation to themselves until such time that they are forced by market pressures to share them with the local population in the form of higher wages and other such improvements. Or in Krugman's stinging words:

Author(s): The Open University

Up to now I have focused on the claims of the antisweatshop movement and the counter-claims of those who contest the purely negative conclusions drawn about the exploitation of another country's poor. To that end, I have, at various moments, touched on issues of demands to take responsibility: whether, for instance, responsibility for sweatshops should be divided up in some way between all those connected to the market system which gives rise to them, or placed firmly at the door of the big r
Author(s): The Open University

• During the 1970s and 1980s, countries such as Hong Kong, Singapore and Taiwan benefited from their low-cost advantages in the new global division of labour. Now, however, the gap between rich and poor nations is wider and competition in the world economy greater, prompting campaigning groups to argue that contemporary low-wage economies do not have the options for economic development that their predecessors had.

• In the face of market fragment
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One issue that might be added by a workers' organisation or trade union, for instance, might be that of freedom of association and the right of workers to organise. Another might be the right to collective bargaining. In fact, the coverage of the codes of conduct vary considerably depending on who instigated the code and the parties involved (Pearson and Seyfang, 2001). Most codes of conduct, it seems, are top-down affairs, drawn up by the companies involved or by trade associations. Some hav
Author(s): The Open University

So far, we have briefly introduced three key approaches to improving the sustainability of human energy use in the future. These are:

• (a) â€˜cleaning-upâ€™ fossil and nuclear technologies;

• (b) switching to renewable energy sources;

• (c) using energy more efficiently.

Author(s): The Open University

Attfield, R. (2003) Environmental Ethics: An Overview for the Twenty-First Century, Cambridge, Polity Press.
Beck, U. (1992) Risk Society: Towards a New Modernity, London, Sage.
Beck, U. (1998) â€˜Politics of risk societyâ€™ in Franklin, J. (ed.) The Politics of Risk Society, Cambridge, Polity Press.
Benington,
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The changing science of ecology, coupled with a greater awareness and development of alternative styles of managing natural resources, continues to influence our notion of what is good and what is right for nature. One of the first and most influential formal expressions of an environmental ethic that arose from early organic and ecosystems models of ecology was that of Aldo Leopold. Leopoldâ€™s argument is regarded as an environmental ethic because it explicitly gives moral consideration to,
Author(s): The Open University

Nature Matters considers environmental responsibility and what may matter from a caring perspective and an accountability perspective. A reading by Andrew Light reflects on four key debates in environmental ethics regarding the way in which nature is valued, and prompts the question on how such debates might inform environmental responsibility.

Section 2 examines the formal processes involved in developing accountability in the context of sustainable development. The persuasiveness of t
Author(s): The Open University

Analyses of over 400 proxy climate series (from trees, corals, ice cores and historical records) show that the 1990s was the warmest decade of the millennium and the 20th century the warmest century. The warmest year of the millennium was 1998, and the coldest was probably 1601. (Climatic Research Unit, 2003)

Throughout historical times, fluctuations in the Earth's mean temperature have been recorded. During the seventeenth century, the Thames periodically froze over during winter and m
Author(s): The Open University