Thorns differ from prickles in having

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(D) Thorns are modified stems,which means they have an $endogenous$ origin,possess a $vascular$ supply,and are often covered by $bark$. Prickles are s

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All of these

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(D) Thorns are modified stems,which means they have an $endogenous$ origin,possess a $vascular$ supply,and are often covered by $bark$. Prickles are superficial outgrowths of the epidermis or cortex ($exogenous$ origin) and lack a $vascular$ supply. Therefore,thorns differ from prickles in having all of these characteristics. Examples of thorns include $Bougainvillea$,$Carissa$,and $Duranta$.

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