M. Ananda Kumar, scientist, Nature Conservation Foundation says that elephants are "engineers of the eco-system. He explains : they are seed (1)_____ . Forests without (2)_____ have been observed to not have young (3)_____ at all. This is because (4)_____ species disperse seeds only through elephants." The animals are phenomenal at (5)_____ themselves to new ecological conditions and negotiating a problem.
Select the most appropriate option to fill in blank No.(4)
Identify the most appropriate option to substitute the underlined segment. If no substitution is required, select No substitution. The shoebill stork can be recognise from its long legs and broad wings.