Atlas is successfully able to use his pincer grip to grab and manipulate objects in his environment. the pincer grip is the ability to

The pincer grip is the ability to hold objects between thumb and index finger.  

The pincer grip is the ability to hold and manipulate objects between thumb and index finger. The pincer grip usually emerges in infants between 12 and 15 months of age. With this ability, a child can turn the pages of a book, and open and close a zipper.

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

sorry, but you do not have posted the diagram.