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Science

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chapter 20 vocabulary
Vocabulary part 7
vocabulary part 8
Vocabulary part 7
vocabulry part 6
vocabulary part3
vocabulary part4
vocabulary part2
animal definitions
From Flower To Fruit
HOW DOES PLANT FERTILIZATION OCCUR?
endocrine glands
Plant Characteristics
THE MALE REPRODUCTIVE SYSTEM
FEMALE REPRODUCTIVE SYSTEM
nervous system
nervous system part 2
definitions on the cardiovascular system
BODY ORGANIZATION
Chapter HIGHLIGHTS Part 2
medtropilis
The Integumentaty System
DNA
How can DNA become damaged?
The Muscular System
quiz yourself
QUIZ part 2
Scientific method
Cell cycle
Cell Division
DEFENITIONS
test your brain
answers to test your brain!
vocabulary chapter 23
science time line on cell division
life science
need help
Gregor Mendel
Mendels second experiment
Terms to learn
Chapter Highlights
Vocabulary part 5
The Integumentaty System

What Determines Skin Color 

A darkening chemical in skin called melanin determines skin color. If a lot of melanin is present, the skin is very dark. If only a little melanin is produced, skin is very light. Melanin in the upper layer of the skin absorbs much of the harmful radiation from the sun, reducing DNA damage that can lead to cancer. However, all skin is vulnerable to cancer and therefore should be protected from sun exposure whenever possible. 

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