During prophase 1 of meiosis, the homologous chromosomes pair up to form tetrads. What are two outcomes of this pairing that increase genetic Variation?

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.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

answer; aerobic conditions; citric acid cycle (krebs cycle) electron transport chain;         anaerobic conditions; fermentation; both glycolysis;