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To protect themselves and warm other amimal.
The Surface Area of the Pebble plant that is exposed to the Sun will be greater and will become too hot; hence the pebble plant will lose lots of it's water.
The Surface Area of the Pebble plant that is exposed to the Sun will be greater and will become too hot; hence the pebble plant will lose lots of it's water.
They can't protect themselves from herbivores.
Insert genes that produce anti-insect chemicals into the plant
Cacti have spines to protect themselves form animals who want the water stores in the plant.
Ocean plants can't usually 'protect' themselves but they are well camouflaged so the predators don't see them.
Some herbivores have evolved ways to hijack plant defenses to their own benefit, by sequestering these chemicals and using them to protect themselves from predators. Plant defenses against herbivores are generally not complete so plants also tend to evolve some tolerance to herbivory.
Plant predation is when plants uses some techniques in order to protect themselves from other predator. For example, roses use spikes to keep our hands from grabbing them.
Some plants have thorns on them and that's so the animals can't eat the plant. Some plants have thorns on them and that's so the animals can't eat the plant.
To discourage herbivores from eating the plant.