Which is a difference between the Paleozoic and Mesozoic era? Animals lived in the water during the Mesozoic and on land in the Paleozoic.
The first birds emerged in the Paleozoic era while mammals first emerged in the Mesozoic.
Many different species of dinosaurs lived in the Mesozoic, but they all died off in the Paleozoic.
Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era.

Cooperation among oligopolies runs counter to the public interest because it leads to underproduction and high prices. in an effort to bring resource allocation closer to the social optimum, public officials attempt to force oligopolies to compete instead of cooperating. consider the following scenario: suppose that the presidents of two auto manufacturing companies exchange text messages in which they discuss jointly raising prices on their new lines of hybrid suvs. this illegal communication would violate which of the following laws? the sherman antitrust act of 1890 the robinson–patman act of 1936 the celler–kefauver act of 1950 the clayton act of 1914

What factor contributed most to the beginning of the women’s rights movement in the united states during the mid 1800s? a dramatic increase in women’s participation in the workforce b a shift in social attitudes brought on by increased sectional tensions c the experience of gender discrimination within reform movements d the granting of voting rights to african american men

Most galaxies in the universe are irregular-shaped galaxies. true or false ?