Answer:
21%
Explanation:
To remember this percentage, use the amount of land and water on earth, like this: 3 (land) x 7 (water) = 21
(note: oxygen does not change depending on land or water amount)
Mitochondria and chloroplasts both do their part to break down nutrients in their cells to create energy
D- oesophagus
The stomach, small intestines,liver secret digestive juice.
