Changes

#* Toxic organic and inorganic substances

#* Toxic organic and inorganic substances

#* Toxins produced by infectious organisms

#* Toxins produced by infectious organisms

# Nutritional

# '''Nutritional'''

#* Deficiencies of vitamins and trace elements

#* Deficiencies of vitamins and trace elements

#* Excess vitamins and trace elements

#* Excess vitamins and trace elements

# Genetic defects

# '''Genetic defects'''

#* There is a very wide range of potential defects.

#* There is a very wide range of potential defects.

#** Some are incompatible with life

#** Some are incompatible with life