Answer: Nucleotides
Explanation: DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).
<span>a structure, behaviour, or physiological process that helps an organism survive and reproduce in a particular environment
ex) Camouflage - stick insect</span>
B) fetus
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Answer:
Once you begin swallowing, the process becomes automatic. Your brain signals the muscles of the esophagus and peristalsis begins. Lower esophageal sphincter. When food reaches the end of your esophagus, a ringlike muscle—called the lower esophageal sphincter —relaxes and lets food pass into your stomach.
Positive feedback is when you say something positive to someone. Example if someone says what do you think about my shirt? And you reply i love it! Its positive feedback. I hope this is what you here talking about
