Maria is a waitress at a popular diner. A customer at one of her tables tells Maria that he is allergic to shellfishIn which of the following situations did Marla NOT do her part in helping prevent an allergic reaction?

Which of the following examples can cause gene flow between populations? a.an increase in predators to a population of zebra b.a volcanic eruption that kills half of a population of mice c.bird droppings that contain seeds from a different location d.a person that sprays a toxin on a group of mosquitoes

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Are the earth's ocean floor and continents the same age geologically? why or why not?