How are proteins, lipids, and polysaccharides similar?

In which layer do organisms on earth love?

Which factor affects the force of gravity between objects? check all that apply. direction distance mass shape time

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?