He took a step backward when he saw the snake.

The English alphabet has five vowels.

She is conscious of her surroundings.

The prehistoric era was a time before written records.

The cortex is the outer layer of an organ or structure.

I received a handout from the charity organization.

Regular exercise can help reinforce your immune system.

The emperor ruled over the kingdom with absolute power.

Regular exercise can help boost your metabolism.

The news of the new product circulates quickly among the customers.