What is the function of oxygen in cellular respiration? A. to give a source of energy to the Krebs cycle.
B. to provide oxygen for the production of carbon dioxide.
C. to deliver hydrogen ions to the electron transport chain.
D. to pick up electrons at the end of the electron transport chain.

Which example describes a mutualistic relationship between organisms? young wasps prey on caterpillars. crabs eat the remains of dead fish. tapeworms feed on food in the intestines of cats ants protect a tree on which they feed.

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

True or false multiple lane changes must be done individually going through the same procedures for each lane change