I think the answer is a because if it wasn't many bad ideas for medicine will come and we could get hurt from them.
D. The petting animals option. Mainly because that answer has nothing to do with food and everything to do with regular germs :)
Deciding on a goal, the goal always comes first.
The answer would be : can be caused by environmental toxins.
Hope this helps!
Answer:
Cyclic.
Explanation:
First, we need to know that major mood disorders are characterised by depression, but there are three types: depressive, manic and bipolar. Manic disorder refers to elevated moods, and depression is the opposite. So, mood disorders tend to be cyclic between these two and there is where bipolar moods comes arrive.