What is the morgan-keenan spectral classification system? a method of classifying stars by their temperatures and compositions. a method of classifying stars by their distance from the sun. a method of classifying stars by their age. a method of classifying stars by their age and distance from the earth.

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.