Which of the following statements best describes the field of mechanical engineering
a. mechanical engineering deals with conversion chemicals into useful products
b. mechanical engineering deals with design, construction, and operation of machinery
c. mechanical engineering involves the design of electrical systems
d. mechanical engineering includes the design and constructions of roads, bridges and buildings.

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.