Examlex
Fear of imaginary creatures typically continues to strengthen during the elementary-school years.
Internal Environment
Refers to the conditions and processes within an organism or system, often maintained within certain limits to ensure functionality.
Bilateral Body Plans
Symmetrical body plans in animals that have a distinct left and right side, along with a front and back.
Cephalization
The evolutionary trend towards concentrating sensory and neural organs at the anterior end of an organism.
Nerve Nets
Simplest form of a nervous system found in invertebrates, consisting of a network of interconnected nerve fibers.
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