During the Precambrian era around 4600 to 544 million years ago, only the simplest life existed. There were virtually no organisms producing shells. ___________, few fossils are found in Precambrian rocks.

I like that sweater; _________, it only comes in one color.

The flight was delayed _________ of fog.

I was going to text you, but I decided to call _________.

He apologized as soon as he realized what he had done. _________, he wrote a nice little note to me.

Muscle cells need lots of fuel and ________ burn lots of calories.

The house was too expensive and too big. _________, I'd grown fond of our little rented house.

This plan will reduce waste, and ________ cut costs.