While a man provided directions to a construction worker, two experimenters rudely interrupted by passing between them carrying a door. The man's failure to notice that the construction worker was replaced by a different person during this interruption illustrates
change blindness T/F

True

Explanation:

Change blindness happens when an observer fails to notice large changes of objects or to scenes following a brief visual disruption. That is, visual stimuli undergoes a change without the observer noticing it.

For this case, the man had change blindness .He did not notice the first construction worker he was giving direction to was replaced by a different person. This was after a brief interruption caused by two experimenters passing between them carrying a door.

b. the carbon cycle ensures living things have a source of hydrogen

occluded front i think