1. so更强调前句和后句是因果关系,即由前句可以推知后句.
如：I'm busy now, so I can't help you.
且它经常可以换写成含有becasue引导的原因状语从句的主从复合句.
即：I'm busy now, so I can't help you.
= Because I'm busy now, I can't help you.
2. 而and更多是强调前后间是并列/顺承的关系,并不含有明显的因果关系.
如：I'm busy now, and I am tired.
即“忙并不一定就会导致累”,“我只是又忙又累”而已.
3. 该题翻译为：红色代表着力量,而且它也是热量/激情的象征.
前后两句并不是因果关系：因为红色代表着力量,所以它也是热量/激情的象征.