The first life on earth is commonly beleived to have originated 3.5 bya (billion years ago), yet the rise of atmospheric oxygen didn't take place until almost a billion years after this. what does this tell us about the earliest forms of life on earth?

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

If assuming tasting ptc as a simple gene trait, what other genotype would you select to put in this missing genotype box that could result in this phenotype

Which characteristics are typical of a human population in the postindustrial stage?