There is a continuous variation in the shades of human skin. What type of inheritance does this illustrate? multiple alleles
polygenic inheritance
sex linkage
codominance
incomplete dominance

When is your breathing likely to speed up? a. when your white blood cells increase b. when your cells need more energy c. when your heart cells need more carbon dioxide d. when your blood cells have too much oxygen

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.

Which of these is evidence of global warming? a. overall rising seal levels b. falling global temperatures c. an increase in the size of glaciers d. stable precipitation patterns appex