The Following Are All Characteristics of Earthworms: Segmented Bodies, a Spiral

question 128

Essay

The following are all characteristics of earthworms: segmented bodies, a spiral cleavage pattern, a terrestrial lifestyle, a complete gut, a blastopore that develops into a mouth, tight junctions between cells, and bilateral symmetry.In what order did these characteristics evolve?

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Definitions:

Ganglion Cells

Neurons located in the retina that receive visual information from photoreceptors via intermediate bipolar cells and transmit it to the brain.

Visual Cortex

The region of the cerebral cortex that processes visual information, located in the occipital lobe of the brain.

Feature Detectors

Cells in the visual cortex that are sensitive to specific features of the environment.

Orientation

A person's basic awareness of who, where, and when they are; can also refer to sexual orientation or the initial introduction to a new environment or situation.