Explain why it makes sense that sperm and egg cells have 1/2 the amount of chromosomes than a normal cell that is not involved in reproduction.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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.

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian