Compare and contrast the paired movements of flexion and extension with abduction and adduction.

Flexion and extension refer to decreasing or increasing the angle of a joint and bringing the two articulating bones together along the sagittal plane, while adduction and abduction refer to moving a limb closer to or away from the body midline along the frontal plane.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

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