Extinct means  A) existence  C) found earlier  B) see in future  D) vanish forever

B) Few no. of alpha particles got deflected.

Answer is (A) 27

C) Extinct species

Being creative and unique

Correct option is :(D) germanium Mendeleev was left vacant places in his periodic table for some elements which are not discovered at that time. He named there, eka aluminum for gallium...

(a) endangered

This situation may appear when alien species is introduce unintentionally or deliberately into an area. Some of them may become invasive and cause damage to indigenous species. For example Nile perch...

সাময়ীক যেীন উত্তেজনা বৃদ্ধি করা।

It is known to him that time once gone is gone forever.