How a terrestrial reptile will regulate body temperature if it is placed in a habitat that is extremely dry with the temperature of 55C

The temperature of terrestrial diurnal reptiles rises when the external temperature rises. However, in extreme high-temperature conditions, they need to seek a shelter with some kind of shade (for example, they hide under a rock) or they dive in the water in order to cool down

Explanation:

Terrestrial diurnal reptiles have a homeostatic regulatory mechanism known as thermoregulation, by which their body temperature may be lowered by the loss of heat (i.e., by radiation, convection and evaporation). On the other hand, these species can also raise their body temperature by heat conduction, i.e., by transferring heat from the substratum/air to the body. In consequence, when the environmental temperature is extremely high (e.g., 55°C), terrestrial diurnal reptiles need to seek a shade or some cooler spot where heat can be dissipated, i.e., where their body temperature can be lowered to normal values (27°C-35°C).

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!