Primary succession occurs A. After a disturbance that removes an entire community leaving a sterile environment B. After a disturbance that disrupts a community but leaves a seed bank in the soil C. Right before the secondary succession D. After a severe drought in southwest US which kills all trees and crops

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.