Which of the following statements is incorrect?

Options

A. 1)Evolutionary biologists believe that the success of mammals is largely due to their ability to maintain a constant body temperature
B. 2)The mechanisms used by most mammals to regulate their body temperature 'are similar to the ones that humans use
C. 3) Plants do not have such mechanisms to maintain internal temperatures
D. 4)An overwhelming majority of animals and nearly all plants can maintain a constant internal environment.

Answer

To determine which statement is incorrect among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The first statement claims that evolutionary biologists believe that the success of mammals is largely due to their ability to maintain a constant body temperature.
- This statement is **correct** because mammals are indeed known for their ability to regulate their body temperature (homeothermy), which has contributed to their success in various environments.

2. **Analyze the Second Statement:**
- The second statement states that the mechanisms used by most mammals to regulate their body temperature are similar to the ones that humans use.
- This statement is also **correct**. Humans, like other mammals, utilize similar physiological mechanisms (such as sweating and shivering) to maintain body temperature.

3. **Analyze the Third Statement:**
- The third statement asserts that plants do not have mechanisms to maintain internal temperature.
- This statement is **correct** as well. Plants generally do not have the ability to regulate their internal temperature like mammals do; they rely on environmental conditions and can only adapt to certain extents.

4. **Analyze the Fourth Statement:**
- The fourth statement claims that an overwhelming majority of animals and nearly all plants can maintain a constant internal environment.
- This statement is **incorrect**. While some animals (like mammals) can maintain a constant internal temperature, the majority of animals (ectotherms) and nearly all plants cannot maintain a constant internal environment; their body temperature and internal conditions often change with the surrounding environment.

### Conclusion:
- The incorrect statement among the options is **Option 4**.