Certain results were obtained when scientists studied the interactions of radiation with matter.

Dmitri Mendeleev, John Newlands and Johann  Doberiener were the scientists who made the classification of elements based on their atomic mass in the nineteenth century.

Correct Answer - Co-operating (in any order ) .

Correct Answer - Intraspecific , interspecific

Correct Answer - Mutualism , parasitism

Correct Answer - (i) 151 cm (ii) 128 cm (iii) 23 cm (iv) 141.4 cm (v) 5

Correct Answer - (i) निश्चित है (ii) हो भी सकता है, परन्तु निश्चित रूप से नहीं (iii) असम्भव (iv) हो भी सकता है, परन्तु निश्चित रूप से नहीं, (v) हो...

C) Brisk effervescence occurred

Answer is (D) 5643

(C) Environment

C) Leeuwenhoek