Zain...
It works firstly as it's had billions of years to improve the model. Amoebas replicate very simply. They divide down the middle. Easy peasy. Over time things did get more complex.
But the failsafes thrown into the system are evident in how imperfect it is. 20 MILLION sperm to fertilise one egg. Talk about wastage. And there's not a 100% chance of success that copulation will result in fertilisation. A certain time of the month is required for starters.
Oh, and you left / ignored the long list of errors that I could think of off the top of my head. ERRORS = LACK OF PERFECTION!
The argument "it's complicated so God had to have done it" only works in Church. It has evolved to the state it is, and it works well enough, even with the large numbers of errors inherent the system.

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