1. Just a smear of protoplasm, another speck on the biological scrap heap.

2. 2 Some people believe that Communism has been relegated/consigned to the scrap heap of history.

3. With the closure of the factory(sentence dictionary), thousands of workers have been thrown on the scrap heap.

4. One man, who viewed himself as being on the ‘scrap heap of humanity,’ was feeling miserable and called a friend for help.