Carbon dioxide and hydrogen monoxide
The answer is <em>A.) You have antibodies that already recognize the virus</em>
Viruses and diseases are always changing. When we get sick with say the flu, a virus, or the cold of sorts, our body attacks it until it fights off the disease. You can't get sick from the same strand of sickness because once your body defeats the virus, it knows how to protect the body from it because of the antibodies, so the virus ends up evolving to get past your immune system again.
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Wind is the most common cause of erosion in deserts.
The answer is D. Food Threshold is the amount of food capable on feeding the organisms.
Answer:
It has a pH of 7, so your answer is therefore B.) 7.
