Fossils of Archeopteryx show that this animal had feathers, like a bird. It also had a bony tail, teeth, and claws on its wings, like a reptile. This fossil is evidence that supports the idea that
A. birds and reptiles have a common ancestor
B. birds have changed very little over 150 million years
C. reptile species are more advanced than bird species
D. reptiles are warm-blooded like birds
Ans: A. birds and reptiles have a common ancestor
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Microbes can utilize only carbohydrates for energy production.
Answer the following statement true (T) or false (F)
What is a "benign" tumor?
A) A mass of cancerous cells B) A single mutated cell that could potentially develop into cancer C) A mass of cells that grows out of control and spreads to other tissues D) A mass of cells that grows out of control but remains at the site of origin
How do stabilizing and disruptive selection differ?
A. Stabilizing selection produces adaptation. Disruptive selection is nonadaptive. B. With stabilizing selection, the phenotype for a trait does not influence survival. With disruptive selection, the phenotype for a trait affects survival. C. Stabilizing selection reduces the amount of variation in a trait. Disruptive selection increases the amount of variation in a trait. D. With stabilizing selection, extreme individuals have high biological fitness. With disruptive selection, extreme individuals have low biological fitness.
Lysozyme is found in tears and saliva. It is a chemical produced by cells in your body and is considered a nonspecific immune defense. Lysozyme kills bacteria by attacking their cell walls, making the bacteria more vulnerable. Why is lysozyme considered a nonspecific response to infectious agents?
A) Lysozyme works in the same way on all types of bacteria. B) Lysozyme is found in fluids such as tears and saliva. C) Lysozyme is produced by cells in response to the presence of bacteria. D) Lysozyme destroys bacteria by digesting their cell walls.