Study of the Effect of Mercury Salt on the Presence of Annelida (Lumbricus terrestris) in Soil and the Histological Changes on the Skin Tissue

Table 2

The average weights of worms in grams, which are exposed to different concentrations of heavy metal salt.

Concentrations	Average weights of worms before treatment (grams)	Average weights of worms after treatment (grams)
Control	1.22 ± 0.17 b	1.96 ± 0.12 a
1 ppm	1.11 ± 0.12 bcd	1.06 ± 0.18 bcd
5 ppm	1.08 ± 0.16 bcd	1.03 ± 0.19 bcd
10 ppm	1.04 ± 0.12 bcd	0.94 ± 015 cd
50 ppm	1.14 ± 0.10 bc	0.93 ± 0.12 d
100 ppm	1.12 ± 0.12 bcd	1.11 ± 0.15 bcd

.