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It is a hot summer day. Your dog, Spot, is lying in the shade, panting. The water content in the dog's blood gets low. Spot gets up to find because he is responding to the internal stimulus of .
A) food; hunger
B) water; thirst
C) his bed; sleepiness
D) shade; high temperatures

B. Water; thirst

Explanation:

Water is very vital for survival, even in animals such as dogs. Water is around 90% of blood, so as you can imagine it is very important to consume water regularly to not get dehydrated.

The feeling of thirst is a very important internal stimuli which makes us want to drink water, as our body is fueled on water along with numerous other things. If the water content in Spot's blood gets low, the body will set off a signal for him to get thirsty, which then leads to him getting up to find water.

This is just a way the body continues to work as great as it does, even in dogs! Internal stimuli signals like thirst, hunger, and the feeling of being tired keep our body in check.

b - the respond is innate and varies over time.

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there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: