What age did Ariana Grande start singing?

she started singing at 15 years old.

15 years old

Explanation:

Grande began acting and singing at a young age. By the time she was 15 years old, she made her Broadway debut in “13,” a play about growing up in New York City

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek