What is the condition that results when the lens of the eye thickens and becomes less elastic?

The sentences "The dog bit the boy" and "The boy was bit by the dog" have the same meaning, but differ in ________

a) syntax b) pragmatics c) semantics d) morphology

When adults who are speaking to infants change the pitch and rhythm in their speech, they are altering their ________

a) syntax b) grammar c) morphemes d) intonation