What would happen to a marine jellyfish if placed in fresh water stream and frog ocean water?

Placing a marine jellyfish, adapted to the high salt concentration of seawater, in a freshwater stream would have devastating consequences. Here's what would happen:

1. Osmotic Stress: The freshwater environment has a much lower salt concentration than seawater. As a result, the jellyfish's body will experience osmotic stress. Water will rapidly enter the jellyfish's cells due to osmosis, causing them to swell and burst. This process is known as cytolysis.

2. Cell Damage: The sudden influx of water into the jellyfish's cells disrupts their normal structure and function. Enzymes, proteins, and other essential cellular components become diluted or damaged, leading to cellular dysfunction.

3. Loss of Structure: As the jellyfish's cells swell and rupture, the overall structure of the organism collapses. The jellyfish's bell-shaped body loses its shape and becomes deformed, compromising its ability to swim and move.

4. Organ Failure: The breakdown of cellular processes and the loss of structural integrity lead to organ failure. Vital organs, such as the digestive system and respiratory structures, cease to function properly.

5. Death: Ultimately, the marine jellyfish will succumb to the osmotic stress and organ failure. The collapse of the organism's structure and the disruption of its essential physiological processes lead to its death.

Frog in Ocean Water

On the other hand, placing a frog, adapted to freshwater environments, in ocean water would also have detrimental effects. Here's what could happen:

1. Dehydration: The salt concentration in ocean water is much higher than in freshwater. As a result, water will be drawn out of the frog's body through osmosis. This process causes dehydration, leading to a loss of essential fluids and electrolytes.

2. Ion Imbalance: The high concentration of ions, particularly sodium and chloride, in ocean water disrupts the frog's internal ion balance. This imbalance affects various physiological processes, including nerve and muscle function.

3. Osmoregulatory Failure: Frogs have specialized mechanisms to regulate water and ion balance in their bodies. However, the extreme salt concentration in ocean water overwhelms these mechanisms, leading to osmoregulatory failure.

4. Cellular Damage: Dehydration and ion imbalance cause damage to the frog's cells. Enzymes and proteins become dysfunctional, affecting cellular processes such as metabolism and respiration.

5. Organ Dysfunction: As cellular damage accumulates, vital organs, including the heart, kidneys, and liver, begin to malfunction. This organ dysfunction can lead to severe health problems and eventually death.

In conclusion, both the marine jellyfish in freshwater and the frog in ocean water would experience adverse effects due to the significant differences in salt concentration between their natural environments and the new conditions they are exposed to. These changes would lead to cellular damage, organ failure, and ultimately, the death of the organisms.