Respuesta :
I think I can answer this fully but I'm not sure what the conditions of the rose you are given is. Roses are angiosperms, meaning that they can produce fruit to cover their seeds to repopulate. When you think about what might eat the fruit, you may think about animals. When the animals eat the fruit the seeds are then pooped out and the fecal matter acts as a fertilizer for the seeds. Now, lets say that a long time ago there were many roses which included roses with and without thorns. When the animals went to eat the fruit off of the roses with thorns, the thorns ight have hurt the animal, and the animal would then avoid the roses with thorns because they knew it would cause pain. Instead, they mainly fed on the fruits from the roses without the thorns because it wouldn't have thorns that might hurt them. Over time, animals avoided the roses with thorns, and so the seeds were never spread, and the roses with thorns couldn't repopulate and died. Over time, the roses gene pool narrowed down to only the roses without thorns because the animals would only eat fruit from the roses without thorns, thus spreading the seeds and helping them repopulate, and that is why today they are roses without thorns.
A species of rose lacking thorns evolved from an ancestral rose species with thorns due to different environmental conditions.
According to biologists, a species of rose lacking thorns evolved from an ancestral rose species with thorns due to different environmental condition present around the rose plant. Roses bear thorns in order to protect themselves from the attack of animals so that they can't eat them. It is a defense strategy adopted by the plants in that environment where organisms are present which feed on them.
There are some rose plants are located in such an environment where no herbivores are present so they avoid this defense strategy and produces rose plants without thorns so we can conclude a species of rose lacking thorns evolved from an ancestral rose species with thorns due to different environmental conditions.
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