The development by farmers to produce larger tomatoes is the result of

artificial selection by selectively breeding the larger variants

Explanation:

not only is it colder, it also becomes darker, less salty, and more dense.

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.