Biology

Saprophytism

commensalism

Parasitism

Symbiosis

pH

Salinity

Water current

Turbidity

Blood worm, pond skater and scorpion

Blood worm, pond skater and dragonfly larva

pond skater, scropion and dragonfly larva

Pond skater, blood worm and ant-lion

possession of thin, smoth barks

possession of large tap root

production of seedlings on mother plant

possession of thick, flaky bark

Schistosomiasis

Elephantiasis

Syphilis

Onchoceriasis