(N/A) The phenomenon where organisms from different evolutionary lineages develop similar adaptive features due to living in similar habitats is known as $Convergent Evolution$.
In desert environments,plants like $Opuntia$ and $Cactus$ have evolved spines,which are modified leaves,to minimize water loss through transpiration.
Similarly,animals like camels and kangaroo rats exhibit adaptive strategies to conserve water in arid conditions.
They produce highly concentrated (hypertonic) urine and dry,solidified feces because most of the water is reabsorbed in the nephrons and the large intestine.
Another example is the evolution of Australian marsupials and placental mammals. Despite being distinct groups,they show $Adaptive Radiation$ leading to similar forms (e.g.,the placental mouse and the marsupial mouse) because they occupy similar ecological niches.