The splint bone of the present-day horse is a vestige of which digit?

Which of the following statements is true?

Assertion: From an evolutionary point of view,the human gestation period is believed to be shortening.
Reason: One major evolutionary trend in humans has been the larger head undergoing a relatively faster growth rate in the foetal stage.

Which of the following are the wrong statements?
$I.$ Organs which are different in basic structure and origin but perform similar functions are called analogous organs.
$II.$ Organs with different basic structure and origin but perform similar functions are called homologous organs.
$III.$ Homologous organs lead to convergent evolution.
$IV.$ Analogous organs lead to divergent evolution.
The correct combination is:

Match the following columns:

List-$I$	List-$II$
$(W)$ Placental mammals and Australian marsupials	$(i)$ Adaptive radiation
$(X)$ Darwin's finches	$(ii)$ Convergent evolution
$(Y)$ Giraffe	$(iii)$ Divergent evolution
$(Z)$ Forelimbs of whale and bat	$(iv)$ Lamarckism

During evolution,which of the following plants lost its chlorophyll?