What is an organisms niche like a persons occupation?

Which of the following conclusions can be drawn

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.

The cluster of developing cells from conception until birth is called an