Skin cells are made of proteins, water, and fat. But brain cells are only made up of amino acids, which ca make protein.<span />
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I believe the answer is dopamine
Answer:
Internal heat
Explanation:
I did this in the 4th grade
The sentence a Venus flytrap closes its leaves when its trigger hairs are stimulated is the best example of a living thing responding to its environment (option B).
<h3>What does characterize living organisms?</h3>
The main characteristics of living organisms refer to features shared by different life forms, which are essential to sustaining life, i.e. their metabolic activities in order to perpetuate across time.
One of the main characteristics that sustain life is the ability to respond to environmental stimuli. In this regard, it has been debated if this feature is the main characteristic that sustains life, but detractors of this idea state that it is not the main feature because viruses are able to respond to stimuli and they are not alive.
Therefore, with this data, we can see that the ability to respond to stimuli is one of the main features of living organisms.
Learn more about the characteristics shared by live organisms here:
brainly.com/question/19532605
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