1. Potassium
2. Magnesium
3. Calcium
4. Phosphorous
Magnesium
1. Tadpole
2. Planula
3. Trochophore
4. Ephyra.
Trochophore
1. Exclusively marine
2. Segmentation infinite
3. Distinct head
4. Setae numerous throughout the body.
Exclusively marine
1. Endocytosis
2. Osmosis
3. Passive absorption
4. Active absorption
Passive absorption
1. Vertebrata
2. Echinoderamta
3. Cephalochordata
4. Annelida
Annelida
1. Muddy water had macronutrients dissolved in it
2. Muddy water had macronutrients dissolved in it
3. Muddy water had most of essential elements dissolved in it
4. None of the above
Muddy water had most of essential elements dissolved in it
1. These occur in all segments except first fourteen
2. They are enteronephric
3. They have a complicated nephrostome
4. They are exonephric
They are exonephric
1. R.Hill
2. F.F Blackmann
3. M.P. Kaushik
4. D.L. Arnon
D.L. Arnon
1. Oligochaeta-Pheretima
2. Archiannelida-Glossiphonia
3. Hirudinea-Pontobdella
4. Polychaeta-Nereis.
Archiannelida-Glossiphonia
1. Chlorine
2. Calcium
3. Sodium
4. Sulphur
Chlorine