Which of the following causes day and night? the changing seasons
the revolving Earth
the rotating Earth
the evolving sun

What is turgor pressure, what causes it, and what does it do for a plant?

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

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.