Final answer:
In biology, the term 'deep' refers to a position farther from the surface of the body, such as the brain being deep to the skull, so the correct characteristics are 'Internal' and contrasting term 'Superficial'. The correct answer is d) A and C.
Step-by-step explanation:
The characteristics for the word deep in a biological context generally refer to a location that is farther from the surface of the body. For example, the brain is considered deep to the skull because it is situated well within the head, away from the external surface. The options provided in the question for the characteristics of the word 'deep' are a) Internal, b) Shallow, c) Superficial. The correct characteristics for 'deep' in this context are Internal and Superficial, where 'superficial' is also a biological term but refers to a position closer to the body surface, such as the skin being superficial to the bones. Therefore, the correct answer would be d) A and C.