Jerry loves the smell of the grass after it rains. this is a result of his which has/have received signals from neurons in his sinus cavity

Olfactory bulb

Jerry loves the smell of the grass after it rains. This is a result of his olfactory bulbs, which has/have received signals from neurons in his sinus cavity. Olfactory bulb is a structure located in the forebrain of vertebrates. It receives neural input about odours detected by cells in the nasal cavity.The axons of olfactory receptor cells stretches directly into the olfactory bulb, where information about odours is processed.

answer; ///(b) it is composed of four protein chains and four heme groups;

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