Based on this tree, mammals are as closely related to birds as they are to snakes. 
Definitions:
Cognitive Processes
Mental activities such as thinking, understanding, learning, and remembering.
Unattended Information
Information that is present in the environment but is not the focus of one's attention and hence is processed minimally or not at all.
Sensory Memory
The shortest-term element of memory, which allows retention of impressions of sensory information after the original stimuli have ended.
Primacy and Recency Effects
Psychological terms describing the tendency to remember information that appears at the beginning (primacy) and end (recency) of a list better than information in the middle.
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