Answer:
It needs the spines for protection
Explanation:
The cactus would develop the spines as a form of protection to protect itself from being consumed and to survive longer.
Usually and animal that catches its pray also eats dead animals is classified as carnivore. Do you need clearer classification?
Equal to all other objects around the earth it is unaffected due to earth's gravitational pull
Eukaryotic kingdoms:animilia (metazoa), plantae,Fungi and PROTISTA
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They can exchange both matter and energy, exchange energy but not matter, Isolated systems can exchange neither energy nor matter.
In a closed system only energy can be exchanged; matter stays inside.
In a open system matter and energy can be exchanged
