Major scientific theories include the cell theory, the big bang theory, and the theory of plate tectonics. how are scientific theories formed? a. through a single scientific discovery in which a scientist learns something new b. through the formation of several related hypotheses c. through extensive testing and the accumulation of several lines of evidence d. through meetings between scientists in which they discuss several possible answers to a scientific question

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.