On a Nissan March 2008, I noticed that the some pipes under the hood seem to have cracks or openings in them. Is this normal?
The top photo looks like it is the engine air intake duct before the filter. While the holes shouldn’t be there, it won’t cause a problem, since the hole is before the air filter. If it is after the filter, the hose needs replacing, since you will be letting unfiltered air in. Add another photo showing the whole engine bay.
The second photo is just protection for the wiring harness. The wrap is split like that from original, it is opened up and wrapped around the harness for protection against rubbing on the engine. Nothing to worry about.