|
0.1-- 4 wide 0.2-- 50 long
primitive unicellular
found in fossil
everywhere: sea
continent
fresh water habitat
tissue
reproduce:
fission cell ↑-- spilt 2
↓
asexual budding
conjugation exchange DNA
上一页 [1] [2] [3] [4] [5] 下一页 【已有很多网友发表了看法，点击参与讨论】【对英语不懂，点击提问】【英语论坛】【返回首页】
|