Answer:
The pericardium is the most outer layer of the heart. Main function to protect the heart from external forces/entry.
A. i think its this because they get their energy from gravity. its originally potential energy as a cloud but as the water droplets condense and collect into rain drops they get heavy and that potential energy is turned into kinetic energy. this isnt up there so A.
The pH scale measures the concentration of how acidic or basic something is. The lower the number below 7, is acidic. Above 7 is basic. 7 is waters purest form.
Answer:
Sadness is caused when there is a strong emotional reaction to a particular object.
Sadness can sometimes lead to depression, but more commonly sadness can make you feel tired, angry, or stressed.
Explanation:
Your kidneys act like a filter to remove wastes and extra fluid from your body. Your kidneys filter about 200 quarts of blood each day to make about 1 to 2 quarts of urine
