Answer:
They could all become some sort of food for people.
Explanation: Hope this helps! :)
Answer:
Grey and White Matter.
Explanation:
When looking at an image of trasnverse section of the spinal cord the grey matter is almost butterfly shapped and it has the central canal in the middle. The white matter is surrounding the butterfly shaped, grey matter.
Answer:mercury, lead, chromium
Explanation:
The digestive system breaks down food, the respiratory system takes in oxygen, and the cardiovascular system delivers the oxygen and food to the cells.
Plants use the sun to produce food then animals eat the plants for food
