In mammals, the process of inspiration involves           a. alveolar collapse.   b. negative pressure generated in the chest, causing the lungs to expand to fill the vacuum.   c. the ribs and diaphragm pulling on the lungs to produce expansion.   d. multiple functions within the bronchial tree

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

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.