Which of the following was determined by charles darwin but based on contributions from another scientist a. species can go extinct during catastrophes b. species could go extinct when their environment changed if they could not adapt to the change c. the population can increase faster than the food supply d. the processes that change organisms work quickly and have only been around for a short time

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.