The answer would be osteoporosis
Osteoporosis comes from word osteo- which mean bones and -porosis which means "pore". The term is used to describe a decrease in bone density which makes them seems like having multiple pores. It is found more in the old patient because the bone formation is decreased.
Answer: 70%, although that is an estimation because it is 71%
The term used for a group of words that does not contain a verb or a subject and that acts as a single part of speech is D. a phrase.