What are the organs called that perform different functions but have a similar basic structure?

$(a)$ State any two factors that could lead to the rise of a new species.
$(b)$ How do analogous organs provide evidence in favour of evolution?

If a population of red beetles,living on green bushes,is being eaten by crows. During sexual reproduction,a green beetle is found in the progeny.
$(a)$ What is the future of the new trait?
$(b)$ Will it survive in the new habitat?

In which organisms is a higher degree of variation observed?

Which of the following is the correct match between List-$I$ and List-$II$?

List-$I$	List-$II$
$1$. Acquired trait	$a$. Wings of a bird and wings of a butterfly
$2$. Evidence of evolution	$b$. Wings of a bird and forelimb of a lizard
$3$. Homologous organs	$c$. Docked tail of a mouse
$4$. Analogous organs	$d$. Fossils

Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.