In a body of fresh water, a dissolved oxygen concentration of 0.262 mm or higher is usually needed to maintain a healthy aquatic ecosystem. for a lake to maintain this concentration, what is the maximum water temperature?

We are given that

DO = 0.262mM O2 

And since 1mM = 32mg/L 

Converting to mg/L:

DO = 32mg/L * 0.262mM

DO =8.4 mg/L = 8.4ppm 

Using the nomograph to identify the maximum temperature to maintain 8.4 ppm of DO concentration:

Max water temp is 26 ˚C .

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies