Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

What substance acts to prevent sudden ph changes in bodily fluids?

Use the distance formula to determine weather each pair of segments have the same length