According to Alexander von Humboldt
(1) Species richness goes on increasing with increasing area of exploration
(2) Species richness decreases with increasing area of exploration
(3) Species richness increases with increasing area, but only up to limit
(4) There is no relationship between species richness and area explored
(1) Species richness goes on increasing with increasing area of exploration
(2) Species richness decreases with increasing area of exploration
(3) Species richness increases with increasing area, but only up to limit
(4) There is no relationship between species richness and area explored