Ph 3
me 2
em 2
so 3
sp 2
en 3
steps:
start on improve me(mental) project. and ..
I am too tired to continue my answer..
Instead of using animals in medical expereince, i think<< that scientests could test it on bacteria or humans, if it is safe enough.
Answer:
Causes Psychological Stress
Explanation:
causes of insomnia include stress, an irregular sleep schedule, poor sleeping habits, mental health disorders like anxiety and depression, physical illnesses and pain, medications, neurological problems, and specific sleep disorders.
The cardiovascular system transports oxygen to cells through blood and takes away carbon dioxide from the cells.
Hope this helps... mark as Brainliest plz
