Which of the following is not true about darwin’s book on the origin of species?
a. he worked on the manuscript for three years.
b. it was successful.
c. it explained his theory of evolution.
d. it was based on his findings in south africa.

Darwin's book: On the Origin of Species was indeed successful and explained all of his theory of evolution. Charles Darwin also worked on it for three years (23 years for publication), however, it was not based on his findings in South Africa, though his works were mainly around the South America. The answer is (d.) It was based on his findings in South Africa.