existed

many ancient civilizations existed long before recorded history.

there has always existed a strong bond between them.

in the past, different species of dinosaurs existed on earth.

it is believed that life existed on mars at some point.

a variety of languages have existed throughout human history.

myths and legends have existed in every culture.

once, a great empire existed in this region.

evidence shows that intelligent life may have existed elsewhere in the universe.

only a few records of the civilization that existed here remain.

various forms of art have existed since the dawn of humanity.