Question

read the text.
melanin is a substance produced by the epidermis, the outer layer of the skin. melanin absorbs harmful ultraviolet sunlight, thereby protecting the internal organs from these rays. although everyone has the same number of cells that produce melanin, not everyone makes the same amount of melanin. some people do not naturally produce much melanin; consequently, their skin appears lighter. for both lighter - and darker - skinned people, skin will start to produce more melanin as a result of being exposed to the sun for a long time. this is why a persons skin may appear tanner after vacationing in tropical climates.
match each cause with its effect.
some people do not naturally produce much melanin. the epidermis is exposed to the sun for a long time.
melanin absorbs the suns uv rays.
cause effect
internal organs are protected
the epidermis appears lighter.
the epidermis starts to produce more melanin.

Explanation:

• For "Some people do not naturally produce much melanin": According to the text, less melanin production leads to lighter - skinned appearance.
• For "The epidermis is exposed to the sun for a long time": The text states that long - term sun exposure causes the skin (epidermis) to produce more melanin.
• For "Melanin absorbs the sun's UV rays": As per the text, melanin's function of absorbing UV rays protects internal organs.

Answer:

• Some people do not naturally produce much melanin → The epidermis appears lighter.
• The epidermis is exposed to the sun for a long time → The epidermis starts to produce more melanin.
• Melanin absorbs the sun's UV rays → Internal organs are protected.