The skin plays a role in the production of vitamin D because when dehydrocholesterol reaches the skin by means of the blood and is exposed to ultraviolet light from the sun, it changes to vitamin D in an inactive form.
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Answer:
<u>G. Nitrogenous base</u>
Explanation:
Double-stranded DNA (Deoxyribonuclease) molecules store genetic information. Their 5-carbon deoxyribose sugar, phosphate and one of four nitrogenous bases from which nucleotides derive their name:
The nucleotides on a single strand are bonded together via covalent bonding. Base pairs are formed between nucleotides on opposite strands, due to hydrogen bonding between bases. For instance, <u>Adenine forms double bonds with thymine, while cytosine forms triple bonds with guanine.</u>
The movement of food from the stomach into the esophagus is usually prevent by the sphincter
Ultimately, all scientific knowledge comes from:
Select one
O a. textbooks
O b. experimentation
<u>O c. experimentation & </u><u>observation</u><u> </u><u>✓</u><u>✓</u><u>✓</u>
O d. observation