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Cells Choose the best explanation to explain each statement. Some of the explanations match mor e than one statement. statement because explanation Plant and animal cells have many features because in common Many cells have a large surface area There are some differences between plant and animal cells Plant cells have a cell wall Both plant and animal cells have a cell membrane Animal cells do not have chloroplasts Nearly every type of cell has a nucleus
Interdependence Choose the best explanation to explain each statement. Some of the explanations match mor e than one statement. statement because explanation because the energy is transferred from producer to consumer only plants can make their own food larger animals will eat several smaller ones the amount of available food changes they cannot make their own food (from sunlight) they have similar features they contain the links between organisms organisms may be involved in more than one chain
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For ces Choose the best explanation to explain each statement. Some of the explanations match mor e than one statement. statement because explanation Scientists use arrows to show forces because Things with the same mass may weigh different amounts on different planets An object will stay still An object will move at a steady speed The moon stays in orbit around the earth Astronauts can jump much higher on the moon than on the earth Two magnets will stick together Aeroplanes are a streamlined shape People on the earth don’t notice the force of the moon’s gravity Moving objects usually slow down and stop Skiers move faster on snow than on grass Bulldozers use caterpillar tracks on soft ground Snow shoes stop explorers sinking into soft snow The pointed end of a drawing pin hurts more than the flat end
Energy transfers Choose the best explanation to explain each statement. Some of the explanations match mor e than one statement. statement because explanation Hot things cool down and cold things warm up because When energy is transferred it becomes less useful Fuels are useful The total amount of energy is always the same before and after something happens The batteries in an electric circuit go flat Animals eat foods Plants do not need to eat food Respiration and combustion are similar processes People who eat too much get fatter Ordinary light bulbs are not very efficient Energy cannot be transferred to the earth from the sun by conduction or convection
Scientific enquir y Choose the best explanation to explain each statement. Some of the explanations match mor e than one statement. statement because explanation Scientists repeat measurements because In an enquiry scientists change one thing while keeping everything else the same Scientists make sure they have enough readings Scientists draw graphs of their results When collecting results scientists measure things carefully Scientists often make a prediction Scientists use scientific ideas Scientists often do a control experiment where they keep everything the same
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