Short free response questions

1. proteins, large complex molecules, are major building blocks of all organisms. describe the chemical
composition and levels of structure in proteins.

ap ! this class xd

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

What are some possible consequences of preventing prescribed burns and natural wildfires

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?