Early life clues from amoeba

(New Scientist): Fossil tracks on the seabed could be the handiwork of oversized amoebas that roamed the ocean 1.8 billion years ago, if their modern counterpart is anything to go by. While exploring the Bahamas,  a scientist has discovered a new species of giant amoeba called Gromia sphaerica. As the grape-sized protozoan rolls along the ocean floor, it sucks up and spits out sediment, leaving behind long grooves and ridges. Go to article.