It has two layers.
Hope I could help :)
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
Answer:
D. It is non-living
Explanation:
If something is not made of cells, it cannot be alive.
Harmful because they change how the genes are supposed to form and they can give disorders at times.
B. larger and more complex
Explanation: As the environment became more unpredictable, bigger brains helped our ancestors survive.
