Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. it is now known that a) all of dalton's hypotheses are correct. b) atoms of an element can have different numbers of protons. c) atoms are divisible. d) all atoms of an element are not identical but they must all have the same mass

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.