Select the words that will correctly complete the passage. The fossil record provides evidence about
prehistoric organisms and ecosystems

. Scientists have fossil specimens that
show that nearly every species that evolved is extinct today

. Of the quarter-million or so species found in the fossil record, the majority are
larger than

living species today. One of the drawbacks of fossils is that we cannot directly observe the organisms. This limitation means that scientists
must usually infer how organisms behaved

.