I will give a brainliest if you can help me 1. improved the sewing machine
John J. Audubon
2. studied and wrote about birds
Alexander Graham Bell
3. invented the telephone
Isaac Singer
4. invented the wireless
Guglielmo Marconi

1. improved the sewing machine  - Isaac Singer

2. studied and wrote about birds  - John J. Audubon

3. invented the telephone  - Alexander Graham Bell

4. invented the wireless  - Guglielmo Marconi

Explanation:

Singer is famous for improving the sewing machine and established Singer Sewing Machine Company

Audubon is the famous American ornithologist who was researching about bird species.

Bell was a famous American inventor who invented telephone in 1876.

Marconi was one the most famous inventors of first half of 20th Century, who won Nobel Prize for his work.