A, because it the constant variable
Explanation:
The answer is A.
When the body temperature returns to normal,the respiratory system sends a message to the skeletal system to stop shivering.
Answer:
O: Type O individuals can donate blood to anyone, because their blood has no antigens. However, they can only receive blood from other type O individuals (because blood with any antigens is seen as foreign).
I believe the answer is Sunlight.
In our world, the bimass of plants (which considered as living things) make up 1000 more population compared to another living organism.
The plants get their food mainly from the photosynthesis process that utilize Sunlight, water, and other nutrients from soil.
