Which of the following relates to the determination of age of the tree by counting the number of annual rings
Dendrology
Cytochronology
Numerology
Dendrochronology
'Genetic species concept' was given by
In $1938$, a coelacanth was found in
'Ontogeny Recapitulates Phylogeny' is narrated in which of the evidences for organic evolution?
A star fish with six arms may be a case of