The ozone layer of earth's atmosphere to filter uv radiation. as the ozone layer is depleted, more uv radiation reaches earth's surface. this increase in ultraviolet radiation may be harmful because it can directly cause a) mutations in the dna of organisms b)abnormal migration patterns in waterfowl c) photosynthesis to stop in all marine organisms d) sterility in most species of mammals and birds

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.