How do skeleton types and temperature regulation classify animals?

When it comes to temperature regulation we can classify animals into two different groups, the endotherms, and the ectotherms.
Most mammals and birds are endotherms, which means they can alter their body temperature through their metabolic processes and be independent of the external sources of heat.
On the other sides, many reptiles are ectotherms, which means that they have to rely on external sources of heat, such as the sunlight, to maintain their body temperature

Animals also can be classified into three different groups based on the type of their skeletons. Vertebrates possess an inner skeletal system called the endoskeleton, the arthropods possess external skeleton called the exoskeleton and many soft-bodied marine animals possess hydroskeletons, bodily support systems made out of fluid-filled coelom.

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1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.