The feeding adaptations of leech best represents <u>parasitic way</u>of life. Leeches are invertebrate animals and the phylum to which they belong is Annelida and their subclass is Hirudinea. Leeches have an anticoagulant named as heparin which they inject in the body of the host on which they feed upon. Heparin does not let the blood of the host coagulate and in this way they keep sucking the blood of host organism. Leeches are parasitic because they get benefited out of the host without benefiting the host by any means.
If ΔG is negative, the reaction is always spontaneous. If ΔG is positive, the reaction is non-spontaneous and will require a sustained input of energy for it occur. If ΔG is zero, the reaction is at equilibrium and no work can be done.
