The graph gives the number of varicella (chicken pox) cases between 1972 and 2011. varicella is an infectious disease caused t
disease causes rash, itching, and fever in patients. the varicella vaccine was introduced in 1995. what can you conclude about t
varicella (chickenpox) cases
1972-2011
250,000+
200,000+
the varicella vaccine was
introduced in 1995.
150,000+
cases of varicella
100,000+
*
cases of varicella
50,000

Sexual reproduction in the parent cell will result in offspring with a) identical genetic information. b) half the genetic information. c) double the genetic information. d) four times the genetic information.

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.

Red blood cells are responsible for transporting oxygen in the blood. people with sickle cell anemia were born with a defective gene that results in sickle-shaped red blood cells. individuals with the disease often suffer pain in their extremities due to the build-up of these cells causing blockages in the blood vessels. the shape of the blood cells also reduces the amount of oxygen transported in the blood.