All amphibians and most land-dwelling invertebrates are able to alter their metabolic rates to maintain a constant internal body temperature
able to have a net loss of heat across a moist body surface, even in direct sunlight
ectotherms whose internal temperatures vary with environmental conditions
endotherms that become thermoconformers when in water environments

the answer is c cumulus. cumulus clouds can be seen on a gray and rainy day, because cumulus clouds create thunderstorms. give me brainliest if right.

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micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.