Match the terms to their definition. 1. fertile able to reproduce 2. hybrid offspring of organisms of two different species 3. speciation creation of a new species through evolution 4. sterile unable to reproduce

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?