Element X has two isotopes. The table gives information about these isotopes. Atomic Abundance Isotopee Mass (amu) (%) X-63 62.92965 69.15 X-65 64.9278 30.85 The average atomic mass of element X is amu.

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

Match the description of each organism to the appropriate category