Part of making comparisons involves contrasting unlike characteristics.

Part of making comparisons involves contrasting unlike characteristics is correct statement. It is understood that to make comparison we need different items which create comparison.

This is because if we compare similar items then we will not be able to judge the difference or compare which is better or which is not. Hence, every comparison involves contrasting unlike characteristics otherwise there will be no comparison between similar items.

answer; natural resources;

1. they vary with a higher number because boiling is way hotter than melting