If the Cretaceous mass extinction had not occurred, which group of animals would probably include the largest land animals today?
A) Bony fish B) Insects C) Birds D) Reptiles E) Amphibians
D
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What is the best test of an evolutionary classification?
Sarin gas is an inhibitor of an enzyme that functions in the neuromuscular junction to break down acetylcholine. What is the most likely description of how a person would die after inhaling this poisonous gas?
A. suffocation via paralysis, or a block in stimulation, of the respiratory muscles B. epileptic convulsions caused by disorganized electrical activity in the brain C. by a heart attack D. suffocation via tetanus, or constant stimulation, of the respiratory muscles E. paralysis of skeletal muscles Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the effect of inhibition of acetylcholinesterase? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A flatworm lacks:
a. bilateral symmetry b. a true coelom c. mesodermal tissue d. a nervous system e. a solute regulating system
When he arrived at the Galápagos Islands, Darwin did not observe the amazing tool-using "woodpecker finch" that can modify twigs to pry out grubs. Because there are no true woodpeckers on the Galápagos Islands, this behavior allows this finch to exploit an untapped food source. However, not all members of this species exhibit this behavior, which is probably learned from watching other finches. Therefore, which of the following is NOT true?
A) It is probably not "hardwired" in the brain as a behavior passed on genetically. B) Young isolated at hatching will not know how to do this. C) This "learned" behavior will not lead to evolutionary change in the woodpecker population. D) There must be a great advantage to reaching this food source for this learned behavior to be repeated by most descendants each generation.