Answer:
Are caused by bacteria viruses or parasites
Explanation:
not all cause visible symptoms
it would not be a sexual transmitted infection if not caused by sexual contact
STIs can be contracted by men and women
The answer is option B "declining number and variety of the species in an area." Biodiversity is a variety of life for example a ecosystem has many species which makes it a biodiversity. Now a loss of a biodiversity would be loosing a huge amount of species in that area or ecosystem which would mean the answer is option B.
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The amount of co2 in the atmosphere would increase
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