Qualification > Sciences
Biolgy paper 1 help!
unknown:
--- Quote from: madee on June 07, 2009, 09:16:42 am ---
--- Quote from: unknown on June 07, 2009, 08:42:04 am ---
--- Quote from: kam on June 06, 2009, 12:14:11 pm ---can someone explain the o2 in blood
i dont get tht either
--- End quote ---
hey it was abt to identify x n y remeber
x=lungs n y=blood cells
nw do u get it
--- End quote ---
it was body cells not blood cells
--- End quote ---
yeah body cells srry
12345abc:
plz explain this: if a sperm can survive for 3 days and an egg for 2,and if ovulation occurs anytime from day 13 to 15,why is the fertile period 7 days???
thukon:
If the sperm is injected into the vagina 3 days before ovulation, the egg could get fertilized after 3 days. So take that date as the 10th.
Now if ovulation occurs on the 15th, the ovum survives for 2 days, thats till the 17th, so the egg could get fertilized.
So the 10th to the 17th. Thats 7 days.
12345abc:
oh ok...thanx a ton!!!!!
IGCSE hater!:
can someone please help me with the menstrual cycle?
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