Homologous structures are those that: serve the same function in different organisms share an evolutionary and developmental history in different organisms occur on homologous chromosomes all of these

The correct answer is -

share an evolutionary and developmental history in different organisms.

Homologous structures can be described as structures in different organisms/species that share common ancestor or having same evolutionary lineage but do not necessarily perform similar functions.

For example - Forelimbs of bat and humans are considered as homologous structures but both perform different function.

Thus, second option is the right answer.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.