Plant cells have cell walls and animal cells do not because the plant cell needs it for its activities.
Answer:
Your respiratory system takes in oxygen from the air. It also gets rid of carbon dioxide. Your digestive system absorbs water and nutrients from the food you eat. Your circulatory system carries oxygen, water, and nutrients to cells throughout your body.
Explanation:
The keyword here is "area per volume" which is available in both cases. Besides capillaries are smaller than arteries they have in total more area as there are many vessels of then. The More the area/volum, the less the velocity
Answer: poaching and habitat loss
Explanation: succession and extinction quiz
