Which of the following is NOT an example of macroevolution?
A. One species of birds evolves feathers.
B. One species of birds evolves into many species of birds.
C. One species of dinosaurs evolves into the first mammal.
D. One species of mammals evolves into a new species of mammal.
E. All answers are correct.
A. One species of birds evolves feathers.
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When an individual's immune system responds to an appropriate antigenic stimulus during the course of daily activities, this is called
A. naturally acquired passive immunity. B. artificially acquired passive immunity. C. artificially acquired active immunity. D. naturally acquired active immunity.
Cultures of genetically identical cells are called ____
a. bacteriophages b. clones c. prophages d. prions e. auxotrophs
An organism that can eviscerate its internal organs when stressed is the:
a. sea star. b. sea cucumber. c. crinoid. d. sea urchin. e. brittle star.
Which of the following was a significant new challenge plants faced in moving to land that they had not faced in their aquatic environment?
a. predation b. desiccation c. the need for osmotic regulation d. light availability e. nutrient availability