Which of the following events occurred during the mesozoic era a. dinosaurs became common on land b. whales and dolphins evolved in the oceans c. reptiles evolved on land d. the subcontinent pangaea formedme i have no knowledge of things evolving whatsoever!

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Would really appreciate it, i have an idea but not completely sure

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls