Which of the following describes how plant and animals each contribute to the survival of the other in a cooperative relationship called interdependence? a. Animals supply O2 to plants and plants supply CO2 to animals.

b. Animals supply CO2 to plants and plants supply CO2 to animals.

c. Animals supply O2 to plants and plants supply H2O to animals.

d. Animals supply CO2 to plants and plants supply O2 to animals.

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.