Here's a breakdown:

* Conformers: These organisms allow their internal environment to change with the external environment. They do not expend energy to maintain a stable internal state. This means their internal temperature, salt concentration, or other factors will fluctuate with changes in the external environment.

Examples of Conformers:

* Fish: Many fish are conformers with respect to their body temperature, meaning their internal temperature will match the temperature of the water they live in.

* Insects: Many insects are conformers for temperature and water balance.

* Reptiles: Many reptiles are conformers for body temperature and rely on external sources of heat like the sun.

Important Note: It's crucial to understand that even conformers may have some limited ability to regulate certain internal conditions, but they do not expend significant energy to maintain stability.

Contrast with Regulators:

* Regulators: These organisms actively maintain a stable internal environment regardless of the external environment. They expend energy to regulate factors like temperature, salt concentration, and blood sugar levels.

Examples of Regulators:

* Mammals: Humans and other mammals are excellent regulators, maintaining a stable internal temperature.

* Birds: Birds are also strong regulators, capable of maintaining a stable internal temperature.

In summary:

* Conformers: Adjust to external conditions, less energy expenditure.

* Regulators: Maintain a stable internal environment, higher energy expenditure.

The strategy of being a conformer or regulator is a balance between energy expenditure and the ability to survive in a specific environment.