单选题 Which of the following is tree?

A、 Algae has existed for more than 430 million years.
B、 It is impossible that algae might be the earliest plant on land.
C、 Plants get food from animals in the oceans.
D、 Evolution began after animals appeared on land.

【正确答案】 A

【答案解析】[分析] 参见第一段。