how many grams of nitrogen -16 will br left from a 16g sample after 21.6 seconds if its half life is 7.2 seconds

From Radioactivity

N/N° = (1/2)^t/t•

Where

N=Remaining Mass

N°=Initial Mass

t=Time of decay Or Time spent on decayingb

t•=Half life

N=N°(1/2)^t/t•

N=16(1/2)^21.6/7.2

N=16(1/2)³

N=16(1/8)

N=2g.

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answer; i believe the answer is hydraulic action;

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.