They are dangerous to the environment because they have no natural competition. That being said they have nothing to keep their population in check, therefore, taking away food, and habits from all the other species. Thus, causing species to die out, which in turn ruins the food chain.
A, because plant cells do have membrane-bound nuclei. they have chloroplasts, so that isn't it. Plants don't use oxygen for photosynthesis, but carbon dioxide. The plant walls are made up of cellulose,, not lipids. It must be A.
Carnivores, they eat other animals to obtain their food.
Answer:
nervous system
Explanation:
The nervous system is also a fight-flight system...meaning the reflexes are in work to either fight or fly away.Hope it helps:)