Faced with mounting population pressure and the resultant drain on natural resources, many growing populations wish to migrate, and other dwindling nations import labor. Where are the major sources and destinations of this population growth differential in the world today? What issues do the immigrants bring with them?

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Which is abiotic? a. tree sap b. insect c. sunlight d. wood table