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...central teat or nipple, into which feed a number of channels (or ducts) that convey and temporarily store the milk, following its production by the great mass of cells that make up the bulk of the gland. We get a better sense of the fine-detailed structure of the mammary gland by magnifying just one part of what's shown in (a). You'll appreciate that all the ducts shown...

...central and southern Africa.) Figure 11 shows large quantities of water vapour over the regions where cloud cover can also be deduced from the IR image. What is shown in the water vapour image, Figure 11, where the IR image, Figure 9a, shows little or no cloud cover? (Hint: look at the central Indian Ocean.) The water vapour image also detects diffuse regions of moist air...

...central, unifying theme of the 'Studying mammals' series of units. So is the notion of specialisation of diet - that mammals display adaptations, i.e. specialised teeth or complex stomachs, that enable them to cope with the demands of particular diets. This course addresses these two related themes of energy and of specialisation. Why might omnivorous mammals have 'broken...

...central theme of the 'Studying mammals' series of units, but surely no environment has tested that versatility as much as the rivers and oceans of the world. Mammals are essentially a terrestrial group of animals, but three major groups have independently adopted an aquatic way of life. In moving to the water, aquatic mammals have had to survive, feed and reproduce using...

...central atomic nucleus, which contains the protons, with electrons moving around it. In this picture (or model) the electrons are arranged in layers, like the layers in an onion. Figure 12 shows a simple representation of this for the element carbon. [Figure 12] Figure 12 Chemists' simple representation of the carbon atom. The smaller dots represent electrons moving in...