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...becoming clearer. It seems that some Burgess Shale forms are hard to classify simply because the boundaries between major categories of animal life were still blurred shortly after the Cambrian explosion. In other words, by mid Cambrian time, there still had not been enough time for some groups to have diverged sufficiently from their recent common ancestors to be...

...become prohibitive, breakdowns and lost running hours are excessive. With more lorry capacity, better reliability and a faster service you could easily obtain more business. You decide to rebuild the depot with better equipment, full insulation, an effective sprinkler system and in-company lorry maintenance. You also decide to replace the five old lorries (which have been...

...become woodland if left without interference from factors such as grazing, mowing or ploughing. You can probably think of examples of wasteland or uncultivated fields in your area where this process is starting to happen. Plantations are areas of woodland where the trees have been deliberately planted. Non-native conifers – trees with needles that bear cones and are...