Bill wants to determine his blood type, so he takes a few drops of blood from a puncture wound in his finger and mixes it with various antisera. his blood cells agglutinate when mixed with the anti-a serum but not with the anti-b. therefore, which of the following is true? a. bill could receive type b blood in a transfusion. b.bill could donate blood to an individual with type b blood. c.bill is rh positive. d.bill's plasma contains b antibodies. e.bill's plasma would cross-react with type o red blood cells.

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Explain nonnuclear inheritance. ~ ap biology

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.