What is alexander calder known for inventing?
a.
photography
b.
watercolor paints
c.
the mobile
d.
murals

The mobile.

Explanation:   Alexander Calder is known for inventing wire sculptures and the mobile, a type of kinetic art which relied on careful weighting to achieve balance and suspension in the air. Initially Calder used motors to make his works move, but soon abandoned this method and began using air currents alone.

answer; round wood logs, building materials like (plywood),also pulp and paper products;