When a sperm and an egg unite , they form a zygote
Clouds affect the amount of solar energy by blocking some of the light that reaches earth.
The deep organs
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Answer:
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Explanation:
Many of these diseases can be prevented by the use of viral vaccines, which stimulate protective immunity against the virus without causing major disease. Viral vaccines may also be used in active viral infections, boosting the ability of the immune system to control or destroy the virus.
Nitrogen is released to the abiotic parts of the biosphere from the process death and by bacteria.