To survive the first few minutes or even days, infants are born with or unlearned, organized, involuntary responses that occur automatically in the presence of stimuli.

Reflexes

Explanation:

Reflexes is our ability to make spontaneous movement when we're faced with a certain stimulus. Infants were born with this ability to protect themselves from eminent danger that might exist in their surrounding and increase their survival rates.

Example of Reflexes that can increase the Infants safety:

-When their reflexes make them automatically pull their hands away every time their skin touch something with high temperature.

- Their reflexes make them able to automatically close their eye lids every time dust hit their eyes.

- Etc.

D) To determine if a law is unconstitutional

That power lies with the supreme court which is part of the judicial branch. Indirectly, the president appoints supreme court justices which are confirmed or denied by the senate. This shows one example how all three branches interact with one another, and provide checks and balances.