B. They compare traits that species have
It's an sight observation you're using your eyes to see it it's one of your 5th sences
Answer:
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. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin.
Explanation:
The grass affects the movement by helping the water not over flow / flood
