<span>4. Species
</span><span>Allopatric speciation is were a single species has been separated so long they have both evolved slightly in different "directions" that prevent them from breeding after being reintroduced.</span>
I have solved part of it 2. is constantly 6.compass and part of number 3.is sun
Probably mutualism, maybe commensalism. need more detail about the effects this interaction has for algae.