Where can tephra be found?

Need , i need a scenario of: artificial selectionmutationnon random mating

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

Why is hemophilia more common in males than in females? a.hemophilia is more common in females b.affected males only need to inherit one copy of the allele c.hemophilia affects only males