Can somebody help me with this I really need the answer right now

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.

9. wind power creates pollution. water air soil noise

When analyzing tree rings, what do scientists assume a thin ring indicates?