Organelles, cells, tissues, organs, and organ systems work together to build, break down, take in, and transport many types of that are essential for life.

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

How does science influence the decisions made about social, economic, and political issues?

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.