1. when writing, you can most effectively use a dash to

When you write something, you most effectively use a dash to: get the readers attention. This helps get the readers attention so that they want to read what you write. It also breaks up your word, sentence, or paragraph. So that everything doesn't get all crammed together.

Hope I helped!

- Debbie

Answer (d) may increase or decrease porosity through dissolution or deposition;

The correct answer is a)  a resource with a limited supply; it will run out.