Elementary Biology, Animal and Human |
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alcohol amount animals appearance attached bacteria bees birds blood body bottle butterfly called carbon dioxid carried cause cells closely color composed compound contain corn covered crop cross Demonstration Describe develop digestion drawing eggs energy Examine experiment fish flowers four frog fruit functions give given glass grain grape green ground grow growth head Hence hold human important inches insects kinds known Label Laboratory Study layer leaf leaves legs less liquid living lungs material means method moths mouth natural nucleus Optional organs ovary oxygen pairs pass pieces pistil plants pollen position preparation present produced protein protoplasm proved pupa region removed roots secure seedling seeds shape side single soil stage starch stem structure substance sugar supply surface tiny tion trees tube usually various walls wings wood young