Do all an­i­mals have brains?

Girls' World - - Critter Q&a -

As sur­pris­ing as it may seem, not ev­ery an­i­mal needs a brain like hu­mans do. While your brain is your cen­tral con­trol cen­ter for every­thing you do, some an­i­mals (like jel­ly­fish and sea anemones for ex­am­ple) use sen­sory nerves all over their bod­ies to move, eat and re­pro­duce in­stead. These sen­sory nerves re­spond to the an­i­mals’ chang­ing en­vi­ron­ment in a sim­i­lar way that your brain makes de­ci­sions based on what’s around you.

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