The graph gives the number of varicella (chicken pox) cases between 1972 and 2011. Varicella is an infectious disease caused by a virus. The disease causes rash, itching, and fever in patients. The varicella vaccine was introduced in 1995. What can you conclude about the vaccine?

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d.the size of the geographic area inhabited by a population can cause speciation.

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Anurse is in the dining room and overhears a new nurse tell a client with body dysmorphic disorder that she's much too thin and must eat more before she can go home. the client bursts into tears and runs out of the dining room. what is the best way for the nurse to address this situation?