Lichens are __________
A. symbiotic existence of blue-green algae and fungi
B. symbiotic existence of rhizobium bacteria in the roots of leguminous plants
C. co-existence of coral reef with zooxanthellae
D. existence of mycorrhiza along with leguminous plants
Answer:C
Lichens are __________
A. symbiotic existence of blue-green algae and fungi B. symbiotic existence of rhizobium bacteria in the roots of leguminous plants C. co-existence of coral reef with zooxanthellae D. existence of mycorrhiza along with leguminous plants