Which statement is true? (1 point)
A. • Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
B. O: Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
C. • Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
D. • Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
D. • Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
To determine which statement is true, we need to understand the concepts of endotherms and ectotherms and their ability to control body temperature and insulation.
Endotherms are organisms that generate heat internally to maintain a stable body temperature. They can control their body temperature voluntarily and are capable of insulating their bodies to minimize heat loss. Some examples of endotherms include mammals and birds.
On the other hand, ectotherms are organisms that rely on external heat sources to regulate their body temperature. They cannot generate sufficient internal heat to maintain a constant body temperature and instead adopt the temperature of their surroundings. Ectotherms typically cannot control their body temperature by choice and do not possess the ability to insulate their bodies effectively. Examples of ectotherms include reptiles and amphibians.
Now, let's evaluate each statement:
A. Endotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature involuntarily.
This statement is incorrect. Endotherms can indeed insulate their bodies and have control over their body temperature voluntarily. They are capable of regulating their body temperature by various means such as vasoconstriction or dilation of blood vessels and adjusting behaviors to retain or release heat.
B. Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
This statement is incorrect. Endotherms can both insulate their bodies and control their body temperature by choice. They have the ability to generate heat internally and utilize insulation mechanisms to maintain a stable body temperature.
C. Ectotherms cannot insulate (stop heat loss from) their bodies and can only control their body temperature by choice.
This statement is incorrect. Ectotherms cannot effectively insulate their bodies and often rely on external heat sources to regulate their body temperature. They do not possess the ability to control their body temperature actively or by choice.
D. Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.
This statement is false. Ectotherms have limited ability to insulate their bodies effectively and generally cannot control their body temperature by choice. They rely on behavioral adaptations such as moving to warmer or cooler areas to regulate their body temperature.
Therefore, the correct statement is B: Endotherms can insulate (stop heat loss from) their bodies but can only control their body temperature by choice.
The correct statement is:
D. Ectotherms can insulate (stop heat loss from) their bodies and can control their body temperature by choice.