Keratin provides what? a. waterproof covering
b. insulation
c. protection from UV radiation
d. pigmentation
can someone help me plz..
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What did hunter gathers do to alter the environment?

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.

How are fossils most commonly formed