A study into animal welfare in a zoo was carried out by observing the behaviour of some of the animals in their enclosures - Scottish Highers Biology - Question 22 - 2019

To assess which animals show signs of poor welfare, we can analyze the behaviors listed:

1. Lion: Continuously pacing back and forward is often a sign of stress and confinement.
2. White rhino: Repeatedly chewing the bars of enclosure indicates a desire to escape and stress.

Based on this analysis, both the lion and white rhino exhibit concerning behaviors suggesting poor welfare. Therefore, the correct answer is:

C) Lion and white rhino.