Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
Hope this helps!
Answer:
Activates or suppresses
Explanation:
The hormonal system or the endocrine system involves chemical systems where feedback loops of hormones are released directly into the circulatory system by internal glands.
It involves the interaction between the hypothalamus, pituitary glands and sex glands.
Release of hormones is dependent of signalling therefore behaviors such as stress, eating patterns and tension can activate or suppress various aspects of the hormonal system.
I’m pretty sure it’s either D or A
