Humans are not the only animals known to use tools. Crows have been observed using twigs to extract food from holes or carry objects they would be unable to hold in their beaks. When presented with unreachable food floating in a narrow tube, crows will find small objects, such as pebbles, to drop into the tube, raising the water level until they can reach their prize. What kind of behavior does this demonstrate?
a. operant conditioning
b. classical conditioning
c. cognitive learning
d. innate behavior
c. cognitive learning
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In the following pedigree, the indicated trait is caused by what type of allele?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
Females of various species shop around for males that _____.
A. are nomadic B. are highly selective C. are silent and strong D. make showy displays E. have a large family
Where can you find information to check the accreditation status of a hospital?
Joint Commission on Accreditation of Healthcare Organizations (JCAHO) Federal and state governments Nonprofit organizations Private companies and organizations All of the above
Plant cells often have a large membrane-bound sac that is used for storing water and other substances. This organelle is called:
A. centriole B. chloroplast C. nucleus D. central vacuole E. Golgi body