Hey sis I need help with the work that you did earlier

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

Where do most people in arabia and iraq live? a. in the fertile crescent b. in the rub, al-khali c. in cities d. in and around mecca

The ideas of hammond are most clearly an example of which of the following mid-19th century developments? (5 points) the increasingly liberal nature of slavery after the south enforced stronger slave codes the growing use by northern antislavery activists of moral arguments the increasing number of freed slaves in southern states as a result of gradual emancipation laws the growing tendency of southern slaveholders to use the paternal ethos to justify slavery