Solution:

On a sailboat (sale boat).

Solution:

Rendezvous

Solution:

Arc + tick + circle.
= Artic Circle

Solution:

Yes it is possible only under the following condition or situation.

When the twins were born, their mother was on a ship or boat. The elder one was born on 1st of March. But just after his birth before the younger one could be born, the boat crossed the international time zone and thus, the younger one was born on 28th of February.

Now whenever, a leap year falls, the younger brother will celebrate his birthday two days before the elder one.

Solution:

Inkstand
(In + kst + and)

Solution:

Eggs

Dinosaurs laid eggs long before there were chickens

Solution:

Very large hands.

Solution:

Today & Tomorrow :-)

Solution:

Each word rhymes with its numeric position in the list. (e.g. 'gun' rhymes with 'one', etc.)

Solution:

They're both in the middle of wa'T'er