Question

fill in the blanks to complete the human milestone table

Year Human achievement
1840 - ______________
______ - first skyscraper
1878 - _____________
______ - first powered flight
​

Answer 1

Answer:

Heyy!!!!!

Here is Your Answer!!!

Explanation:

1840-Gregorian Calendar.

1984-First Skyscraper.

1903-First Powered Flight.

Thank You!!!!