Which of the following is not one of da Vinci's contributions to technology?

a. effect of the moon on tides

b. modern theory on the formations of the continents

c. precise observations of human anatomy

d. ideas for space travel

Ideas for space travel.

Studied effect of moon on tides, predicted the theories of

the formation of continents and, his drawing of the Vitruvian man is iconic.

Though he made a lot of engineering contributions in air travel, he did not venture in the space travel.

Hey, the answer to the question would be D.) Ideas for space travel.