Answer:
They're not dangerous they're just valveless venous structures that connect to the skull bones and are a crucial part of the brain to funcion with some sort of infection thing im not really sure, but long story short, dont damage them its bad
Explanation:
The answer is B. Symbiosis. Symbiosis is the relationship least commonly found in nature. Hope it helped you, and have a great day.
-Charlie
Answer:
Internal can be you don't want bad things happening to your body, you don't want drugs affecting your health,etc.External could be you don't want it to affect your family or people around you.For example, like a cigarette if you are smoking in public you can be affecting others passing by or hanging out with you(external)but if it's just you by yourself smoking it is damaging your lungs(internal)
Malnutrition occurs when the body doesn't get enough nutrients.
(Causes include a poor diet, digestive conditions, or another disease.
Symptoms are fatigue, dizziness, and weight loss. Untreated malnutrition can cause physical or mental disability.)
