All organisms have adaptations that help them survive and thrive. Some adaptations are structural. Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear. Other adaptations are behavioral. Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations. Adaptations are the result of evolution.
Mahalia Jackson became one of the most influential gospel singers in the world. At most of Dr. King's speeches and rallies she sang Amazing Grace and other uplifting songs. At the March on Washington in 1963, she sang I've Been 'Buked, and I've Been Scorned in front of 250,000 people.
To coincide with the movie's release, the song was issued as a single in 1972, which slowly rose to #1 in America. Reddy's second album was subsequently titled I Am Woman and included this new version of the song. When this song got a makeover in 1972, the arrangement was changed, as were some lyrics (I can face anything became I can do anything), and a verse was added. These tweaks helped the song become a huge hit.