Read the following about species-area relationship.

(a) On a logarithmic scale, the relationship is a straight line.

(b) Within an area, species richness increased with increasing explored area in an unlimited manner.

(c) The relation between species richness and area for a wide variety of taxa like birds and bats turns out to be a rectangular hyperbola.

(d) Frugivorous birds in tropical forests of different continents, the slope in graph is found to be 0.1.

 In the above, the correct statements are