Weekly Puzzler Answer #23
Last week’s puzzler was two different kinds of LICHENS. In North America alone there are 3,600 different kinds of lichens; worldwide there are more than 20,000 species of lichen! So
Tag: cyanobacteria
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Last week’s puzzler was two different kinds of LICHENS. In North America alone there are 3,600 different kinds of lichens; worldwide there are more than 20,000 species of lichen! So