Unlike the vast majority of elements, the rare earth element promethium has no stable isotopes, which means that it is ...

There are three types of sentence - simple, compound and complex. All three have an equally important role in writing. Complex sentences can be useful for presenting ideas that need layers of ...

The fox jumped over the dog whereas the cat ran around him. Compound-complex sentences combine a compound sentence and a complex sentence. These sentences contain two or more independent clauses and ...