Maria is trying to remember events from her life as an 18-month-old. however, as hard as she might try, she has no conscious memory for anything that occurred before her third birthday. this is likely due in part to the fact that her which is involved in storing explicit memories, was not fully developed at that age.

Hippocampus.

Explanation: According to the question Maria is unable to remember her memories from when she was about a year and half, because the Hippocampus which is a section in the human brain responsible for memory has not fully been formed then.

The Hippocampus normally forms fully at about two years and half and above in humans, therefore it is almost impossible to remember anything that happens before the age of two and half .

answer: he just dumps them all in his mouth

explanation: