What type of selection is occurring because baby's with low or high birth rates are less likely to survive?

im back lol i heard you where asking for me

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

sex cells are usually half's then they find another half and make a fertilize egg