What kinda of living and non living things do a marine biologist study

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.

Describe the function of the endomembrane system? what organelles are involved?

Which event would lead to primary succession of a forest?