Three organisms have part of a gene for a digestive enzyme sequenced, and homologous parts of those sequences are shown below. One organism is a fungus and the other two are green algae.
Organism | Sequence
1 | AGATTCGATTCGCTTTAAA
2 | ACAGTCGAT_CGGCATAAA
3 | AGAT_CGATTCGGTTTAAA

Based on this data, identify which organisms are which and explain why.