1- dong vat nguyen sinh: kich thuoc hien vi, chi la mot te bao nhung dam nhiem moi chuc nang song, phan lon di chuyen bang long boi roi boi hay tieu giam, sinh san vo tinh theo kieu phan doi
-thuy tuc: co the da bao thanh co the gom hai lop te bao, te bao gai tu ve tan cong, te bao than kinh dieu khien hoat dong co the, te bao sinh san: sinh san, te bao mo co: tieu hoa, te bao mo bi co bao ve
=> thuy tuc tien hoa hon dong vat nguyen sinh
2- cach moc choi len tu vung sinh choi giua co the. luc dau mau loi, sau do lon dan xuat hien o lo mieng va tua mieng cua con non, thuy tuc sau do tach roi khoi co the me thanh co the doc lap va hinh thanh co the truong thanh
3 tac hai cua giun dua vaf san la gan : tranh danh chat dinh duong vs vat chu
cach phong tranh:
giun dua-: an chin uong soi
-rua tay truoc khi an va sau khi di ve sinh
-ve sinh moi truong song
san la gan:
-xu li phan de diet trung
- diet oc
-tay san cho trau bo thuong xuyen
-ko cho trau bo an co duoi nuoc
- tieu huy trau bo da phat benh
- ve sinh moi truong sach se
xin loi may minh hu nen ko co dau!
chuc ban hoc tot!
