Biology

longer neural spine.

wider neural canal.

thicker centrum.  

shorter transverse process.

Pulmonary artery

Anterior vena cava

Pulmonary vein

Posterior vena cava

they have low molecular weight.

most of them are fat soluble.

they cannot be reabsorbed into the blood.

little amount is required by the blood.

reproductive system.

nervous system.

respiratory system.

digestive system.

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