Identify $X$ and $Y$ in given figure

Identify the events $(A, B, D$ and $E)$ in life of general reproduction

Which one of the following generates new genetic combinations leading to variation?

$A$ -In Plant, the end of juvenile phase which makes the : beginning of the growth phase.

$R$ -In Plant, Juvenile phase is also known as vegetative phase.

Select the incorrect pair :

Which reproductive adaptation is characteristic of most terrestrial vertebrates but not of most aquatic vertebrates?