What is the function of the AV ventricle

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.

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Individuals do not compete directly for resources, but are prey for the same predator