The increase in brain size in mammals has been associated with the evolution of endothermy. which of the following best explains this link?
a. endothermic animals require a large hypothalamus to regulate temperature
b. increased jaw musculature associated with chewing allows for an expansion of the braincase
c. endotherms have nasal turbinates which require a large frontal lobe in the brain
d. most endotherms are herbivores and require an increased brain size to process the cellulose in the plant material
e. insulating fur requires individual nerve endings which lead to an increased number of synapses in the brain