Whats the independent and dependent vairable?

NaCl (%)	Plate section	0 Hours Eggs (#)	24 Hours Swimming (#)	48 Hours Swimming (#)	Hatching viability (%)	Average Hatching Viability (%)
0	I	23	0	0	0%	0%
0	II	20	0	0	0%	No data goes here
0	III	30	0	0	0%	No data goes here
0.5	I	20	0	2	10%	8.5%
0.5	II	26	1	2	11.5%	No data goes here
0.5	III	25	0	1	4%	No data goes here
1	I	22	0	3	13.6%	11.5%
1	II	27	1	2	11.1%	No data goes here
1	III	30	1	2	10%	No data goes here
2	I	25	0	3	12%	14.8%
2	II	22	1	2	13.6%	No data goes here
2	III	21	1	3	19%	No data goes here