Answer:
If I where to guess I would say b and c.
sorry if its not correct
Explanation:
One commonality is the ability to grow and reproduce through the production of new cells; cell division.
Alpha helices and Beta pleated sheets make up the secondary structure of protein.
The earth is surrounded by <em>a layer of</em> gases called the <em>atmosphere</em>. The atmosphere is very <em>important </em>to life on <em>Earth</em> and does many <em>things</em> to help protect life and help<em> life </em>to survive.
The atmosphere absorbs the <em>heat</em> from the <em>Sun </em>and keeps the heat <em>inside</em> the atmosphere helping the <em>Earth </em>to stay warm, called the <em>Greenhouse </em>Effect.
They are capable of dividing and renewing for Long periods of time They are unspecialized and they can give rise to speacialized cell types
