Excreta preserved as a fossil is called as

$A$ pair of analogous organs is

Which of the following is not the result of convergent evolution?

The homologous structures are

In the evolutionary history of the human heart,it is observed that it passed through a two-chambered heart like that of fish,to a three-chambered heart like that of amphibians,and finally became a four-chambered heart. Which concept is closest to this statement?

Define and explain the following terms: $1$. Analogous organs,$2$. Vestigial or rudimentary organs.