There are 3 types of cousin system
If we share grandparents but differnt parents we are 1st cousins
.
If we share great grandparents but have different grandparents we are 2nd cousins
If we share great great grandparents but have different great grandparents we are 3rd
cousins
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How the Heart and Circulatory system work.
Nervous system
Hormones.
pulley system, much like the cabled elevators work.
a system is something and if you take one part out it wont work properly