Dicynodonts Were Pig-Sized Reptiles That Lived During the Permian Geologic

question 40

Multiple Choice

Dicynodonts were pig-sized reptiles that lived during the Permian geologic period.An increase in dicynodont species diversity occurred soon after the Permian extinction.Given what you know of this period,this increase in dicynodont species diversity represents ________,most likely due to ________.

• A)competitive exclusion;the fact that they needed new food sources
• B)adaptive radiation;a morphological innovation among dicynodonts
• C)adaptive radiation;the availability of previously unoccupied niches
• D)competitive exclusion;intrasexual selection leading to anagenesis

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Definitions:

Fornix

A C-shaped bundle of nerve fibers in the brain that acts as a major pathway for transmitting signals related to memory between the hippocampus and other brain regions.

Hypothalamus

A compact area within the brain that is vital for numerous essential activities, such as hormone secretion and body temperature control.

Thalamus

A structure in the center of the brain that acts as a relay station for sensory information, excluding smell, to the cerebral cortex.

Amygdala

A part of the brain involved in experiencing emotions, particularly fear and pleasure.