Is salinity a biotic or abiotic factor?

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Which of the following is caused by reproductive isolation within a species? a. a decrease in gene flow b. an increase in genetic flow c. a decrease in genetic drift d. an increase in gene flow

For each of the formulas, classify the formula as either an empirical formula, a molecular formula, or both. nahco3 empirical molecular both