Explanation:
The collaboration of human beings began in the past especially to offer security for offspring. Families living in communities had prolonged life for offspring due to collective security for the benefit of the whole community. Even when some members of community went to hunt or gather food, they are assured to the security of their offspring living in the community. It is believed it is such acts of collaboration that evolved into the current social fabric of society.
Learn More:
To learn more on humans evolution towards collaboration check out;
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This is known as Onesky.
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Light that passes through a polarizing filter is called a vacuum.
Answer:
White
Immune
Explanation:
White blood cells, also called leukocytes, are one of the cells that are involved in the body's immune system. They protect the body against various infections diseases and other invaders. Leukocytes are produced in the bone marrow (hematopoietic stem cells). They are not the only cells that are important for the defense of the body but are important.