The respiratory system always needs iron. The red blood cells are in charge of the transport of O2. They need iron to do this.
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Immigration followed by competition
I hope this right, if its not, sorry =)
Answer:
O A. As nutrients increase, the number of life-forms increases.
Explanation:
common sense
Answer:
Explanation:
A scientific researcher performs scientific methods to answer any natural process. The researcher will follow the protocol of a scientific method which includes: observe the natural phenomenon, ask related questions, suggest a hypothesis, perform the experiment and suggest answers.
In the given question if the researcher has to study about the flu virus, the possible questions he would ask will be:
1. The life cycle of the flu virus.
2. Effect of the virus on the life of an organism.
3. The mechanism used by the virus to replicate and to infect any organism.
4. Molecular mechanism of a virus.
Answer:
C. 200 billion
Explanation:
The milky way galaxy is estimated that there is 200 billion stars
