Answer:
Two characteristics are a notochord, and a dorsal hollow nerve cord.
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Answer:
Our eyes can trick our brain in some manner. When the eye see an image, our brain assumes that the image being seen is a image which had been seen in the past. Therefore, our brain is tricked into believing that the image which is being seen is of something which has been visualized before whereas in actual it is a new image. Hence, this is the relationship between seeing of the eyes and perceiving of the brain.
Explanation:
Mutualism is defined as an interaction between individuals of different species that results in positive (beneficial) effects on per capita reproduction and/or survival of the interacting populations.
