The immune system helps guard against infection, protect from UV radiation, and regulate body temperature.
Answer: The cause can be something that causes the problem and the effect is what effected it. If something caused the population to go down the effect would be death rate or birth rate.
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Answer:
it increases the viewing size.
Explanation:
Function of microscope is used to enlarge organisms for better look
Answer:
The replication of a human being through the production of a precise genetic copy of nuclear human DNA or any other human molecule, cell, or tissue in order to create a new human being or to allow development beyond an embryo.
Explanation:
Answer:
the second one
Explanation:
Its photosynthesis, the process of oxygen in plants
