By D Adamson, Marston Bates

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12 cm ~\ 15 mm A I 10 mm B c 25 g 30 g overall length 14 em (7 + 7) we ight 20 9 Varyin g sizes of hou se mice The size of different organisms of the same species varies co nsider ably. For example. the diagrams show three adu lt ho use mice. Their ages are the same and their habit ats arc similar. However. their measu rement s are no t identical. for example. the bo dy length of mouse: A is 7 em. whereas mouse B has a bod y length of 10 em and the body of mo use C measures 12 em in length .

Describe the shape of the antennae. What is the function of the proboscis? What are the spiracles used for ? What is the wingspan of the adult butterfly? 5. Look and read : head 11'1'i: . ,~\{ dorsal spine , mm ~----'\ 7, ' 1 wee k wing ": spiracle _ "... PUPA (chrysalis) length 2 em 3 w eeks IM A GO body leng th ' ,5 em Reproduction and life-cycle of a butterfly 49 After mat ing. the female lays the eggs under cabbage leaves. d uring the summer. They hatch out into caterpillars. These a re cylind rical animals with a thorax and abdomen which are similarin appea rance.

Which are necessary for the process o f . . b) The substa nce pro duced by this process is . . c) This substance is importa nt becau se it pro vides . . d) T he seco nd pa rag raph is abo ut necessary elements co ntai ned In .. . e) A shortage of . •. or ... causes chlo rosis. f) If there is a lack o f .. almost no growth can occur. g) If the soil lacks nitrogen. the plan t has to prod uce it from its o wn .. . h) T he third paragraph is abo ut the impor ta nce of .. i) These elements occur o nly in .

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