2.  cytoplasm

3.  mitochondria

4.  Golgi body

1.  artificial concept of human mind which cannot be defined in absolute terms

2.  real units of classification devised by taxonomists

4.  the lowest units of classification

1.  Chromatid

2.  Chromomere

3.  Centromere

2.  kidney

3.  brain

4.  Heart

1.  Cortisol

3.  Testosterone

4.  Progesterone

1.  endoparasitism

2.  decomposers

4.  Ectoparasitism

1.  hydrophilic

3.  neutral

4.  Zwitter ions

1.  industrial effluents

2.  pollen of aquatic plants

3.  heavy metals

1.  Reptiles

2.  Birds

4.  Fishes

2.  globular protein

3.  lipid

4.  carbohydrate