That type of blood increased susceptibility to smallpox.
Which of the following best explains why, given the A allele's vulnerability to smallpox, natural selection did not eradicate it?
Diseases that the A type is not vulnerable to can affect other blood types.
Do you think that diseases can impact natural selection in any way?
A species will have a better chance of surviving than others if it has evolved tolerance to particular germs.
Why did people acquire dark skin?
- People who lived in regions with strong sunlight evolved dark skin tones as a result of natural selection to guard against ultraviolet (UV) rays, primarily to prevent their bodies from folate depletion.
- UV rays from the sun are what led to skin pigmentation during evolution.
Learn more about ultraviolet (UV) rays
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As unconscious thoughts, feelings, and urges can take a life of their own, Freud called this part of the mind the preconscious unconscious.
According to Freud (1915), the unconscious is the main source of human behavior. Like an iceberg, the most important part of the mind is the invisible part. Our emotions, motivations, and choices are actually heavily influenced by our past experiences and are stored in our unconscious minds.
PRECOCIOUS: Although currently unused, unconscious parts of the brain are readily accessible to consciousness. Freud used the term to make it clear that what is repressed is part, not all, of the unconscious.
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