英语翻译（拒绝翻译软件）

英语翻译（拒绝翻译软件）
The oldest form of fossil known today is that of a microscopic plant.It is similar in form to common algae in ponds and lakes.Scientists know that organisms like it flourished and multiplied almost two billion years ago.But algae are a relatively complex form of life.Life in some simlper form surely originated much earlier.