Conjunctions of reason

We join sentences to say the reason something happens or the purpose for doing something.

because, as, since, for

These conjunctions can appear in the middle of a sentence.

Black soldier fly larvae are chosen for the composting project because they are not pests for humans.

Students have boosted their understanding of life cycles for they observe how the larvae transform into pupae.

When "as" or "since" starts a sentence, a comma is needed after the introductory clause.

Since students throw away their leftover food, the school has decided to use this food waste to produce its own fertiliser.

As all the food waste has been consumed, we can proceed to collect the frass generated from the larvae.