"Știința și tehnologia au schimbat lumea."

Translation: Science and technology changed the world.

[IliaDamian]

I don't seem to understand why the only type of tense used in duolingo is the simple tense.

[WarsawWill]

Agreed. Present Perfect makes more sense here, as presumably they will continue to change the world.

[UlfGManneb]

Agree also. "Science and technology has changed the world" is more natural

[BenYoung84]

*have changed

[UlfGManneb]

Thank You!

[UlfGManneb]

Sometimes the definite articles have to be translated even if it creates bad english Sometimes they cannot be translated . Make up your mind if I may be so bold!

[Glenn_ski]

I took a chance and wrote "Science and technology have changed the world." It was accepted.