Which of the following was not evidence for the cause of the most recent mass
extinction?
a. iridium b. foraminiferan fossils c. shocked quartz d. lava flows

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.

Which describes a grizzly bear’s habitat?