T: Parasites rarely kill their hosts right. Instead they keep them alive as long as needed. In fact, the best parasites never actually kill their hosts, though they may weaken them significantly. Explain why parasites would not want to kill their hosts immediatel

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?