Avogadro tells us that we have 6.023 x 10^23 SiO2 units per gram, so there would be 6.023 x 10^23 / 60 ≈ 1 x 10^22 SiO2 units in a gram of pure SiO2, and with SiO2 composed of 3 atoms<span>, that puts us at </span>3<span> x 10^22 atoms per gram of SiO2. Now, a grain of sand does not weigh 1 gram. It weighs less</span>
It is basically a structure which helps segregate the chormosomes in to the daughter cells
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Answer:
Agricultural revolution, start of Neolithic era, maybe 12000 yrs ago
Explanation:
Answer:
zygote, fertilization
(haploid) spores, meiosis
a pollen tube