In terms of descent, what does it mean to say that humans are more closely related to gorillas than to monkeys?

This would indicate that evolutionarily humans descended from the same family as the gorillas than monkeys in the view of natural selection and in genetics. Moreover, genetically, the structural foundation os the DNA of the humans and gorillas are 90% the same which suggests a greater correlation and relativity between the species.

Lichens are the first organisms to colonize bare rock, they are therefore the pioneer species in primary succession.