What has to happen to the organism before it turns into a fossil?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Explain the physiological changes that occur when the hypothalamus stimulates the sympathetic nervous system. you can make a flowchart or a simple step process. be sure to include all chemicals/hormones secreted, glands involved and the functions of each chemical/hormone.

The offspring of two different species