Fixed verse forms are a kind of template or formula that poetry can be composed in. The opposite of Fixed verse is Free verse poetry, which by design has little or no pre-established guidelines.
The various poetic forms, such as meter, rhyme scheme, and stanzas guide and limit a poet's choices when composing poetry. A fixed verse form combines one or more of these limitations into a larger form.
A form usually demands strict adherence to the established guidelines that to some poets may seem stifling, while other poets view the rigid structure as a challenge to be innovative and creative while staying within the guidelines.
Because deforestation is causing animals to loose the habitats die then become extinct. Also some rain forest that produce our oxygen are being destroyed and this could cause further trouble in the future.