Vähkide välisehitus (kordamine)
1. Milleks on vajalik tugev kitiinkest ja millest see koosneb (millisesse aineterühma kuulub kitiin)?
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2. Vähkide kitiinkest on väga tugev ning ei veni üldse. Kuidas saavad vähid kasvada?
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3. Nimeta 5 Eestis elavat vähiliiki. Mille
poolest nad omavahel erinevad?
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4. Mida näed piltidel? Seleta pikemalt!
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