Homologous structures are
A. structures of animals that have different appearances and functions but seem to have evolved from the same body part in a common ancestor.
B. structures of animals that have the same appearances and functions but obviously no common ancestor.
C. structures of animals that have different appearances and functions but different ancestors.
D. structures of animals that appear to have evolved from different parts of their bodies.
Answer: A
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Age-related changes in systems other than the nervous system include
a. a decrease in the size of the heart. b. a break down of alveolar walls in the lungs. c. the buildup of cholesterol plaques in blood vessels. d. a decrease in blood transport to organs. e. all of these.
Birds and mammals have a more active lifestyle than reptiles due to
A) insulation over their body surface. B) internal fertilization. C) a slower metabolism. D) internal fertilization and a high, constant body temperature. E) a high, constant body temperature and insulation over their body surface.
What makes a mineral element essential for plant growth?
A. As its concentration increases, the plant grows more. B. It can only be found in organic fertilizers. C. If it is missing, the plant cannot grow or reproduce normally. D. It contributes to the solute potential of the plant. E. It is part of typical chemical fertilizers.
Compare and contrast what happens in mitosis and meiosis.
A.Mitosis is important for growth and repair, while meiosis occurs in cells involved in sexual reproduction. B.Mitosis is important for reproductive cells, while meiosis is needed for growth and repair of body cells. C. Mitosis is a process that results in genetically different daughter cells, while meiosis is a process that results in identical daughter cells. D. Mitosis is a process that requires two cell divisions, while meiosis is a process that requires one cell division and results in identical daughter cells.