They come from the atmosphere, since plants use carbon dioxide to produce carbohydrates :)
Hmm good question. Well I would have to test it for where there are no living life. I would have to build another NASA in the County because there is plenty of room there. Mars is made out of Dusty Crust that is about 30 miles thick. And let's say that the desert's Dusty Crust is about 5 miles - 15 miles thick. That will give about the same amount of surface that mars has. So we would know what to build for a perfect lander to work on Mars. This isn't much but it is something.
Answer:
B. Hypothalamus
Explanation:
Hypothalamus controls all the aforementioned functions. A tumor caused a reduces functionality
The correct answer is C. Artiodactyls
They've been around more than the others and have existed for some 55 million years.
Answer:
1. False
2. True
3. True
Explanation:
I'm pretty sure these are right, I hope this helps!
