Create your own foam head cutout with any photo in minutes at the lowest cost. Ships tomorrow. No extra fees. Done in minutes with the click of a button. Choose your photo and we will make it within a 18Ã24 size on quality foam board and water resistant vinyl, whichever is tallest or widest for your cutout big head.
Precambrian time includes Earth's history from birth up to 590 million years ago. That is, the Precambrian spans 90% of Earth's existence. Fossilized bacteria and blue-green algae show that primitive life existed at least 3,500 million years ago, and possibly earlier.
Phylum Protozoa. Paramecium, A Unicellular Animal. There's no doubt about it that the earliest forms of life were simple unicellular organisms and in that respect protozoans must be considered the earliest animals. Many of these have survived the longest geological periods with very little change.