Observed frequencies of plant species at two sites on the Wimbledon common are given below:

For each site

Species of Plant	Site 1	Site 2
Achillea Milefollia	0	10
Arrhenatherium elatius	0	70
Calluna Vulgaris	5	0
Deschampsia flexusosa	25	0
Festuca Rubra	80	0
Heracleum sphondiilym	0	0
Trifolium Repense	0	5
Vicia Sativa	0	1

a) Use the Shannon index to express the plant species diversity.

b) Compute the maximum Shannon diversity possible for the given number of species.

c) Calculate homogeneity values.

d) Calculate heterogeneity values.