How do endotherms and ectotherms differ?
a. endotherms are regulators and ectotherms are conformers.
b. endotherms are warm-blooded and ectotherms are cold-blooded.
c. endotherms and ectotherms differ in the means by which they regulate their body temperature.

c. Endotherms and ectotherms differ in the means by which they regulate their body temperature.

Explanation:

Endotherms are animals (primarily birds and mammals) that maintain a constant body temperature independent of the environment, they are also known as warm-blooded animals. If an endotherm's heat generation exceeds the heat loss mechanisms as panting increases the heat loss, if the contrary happens metabolism increases to make up the loss.

Ectotherm, also known as cold-blooded animals, are those animals whose regulation of body temperature depends on external sources, these sources can be sunlight or a heated surface. Some examples of these animals are fishes, amphibians, invertebrates, and reptiles.

Considering this information we can conclude that the correct answer is c. Endotherms and ectotherms differ in the means by which they regulate their body temperature.

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the overall balanced equation

6co2 + 6h2o > c6h12o6 + 6o2

sunlight energy

where: co2 = carbon dioxide

h2o = water

light energy is required

c6h12o6 = glucose

o2 = oxygen