9. which of the following best describes what happens during a cross-over event? (2pts) a) tetrads change orientation as they line up along the center of the cell. b) chromatids of homologous chromosomes exchange corresponding segments c) x and y sex chromosomes overlap and combine together during metaphase. d) spindle fibers overlap and attach to the wrong chromosomes during anaphase.

Which process can increase the rate of greenhouse gas emissions into the atmosphere in response to a decrease in albedo

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

Which is the graph of the piecewise function f(x)? f(x) = image for option 1 image for option 2 image for option 3 image for option 4