What caused the oxygen levels in Earth’s atmosphere to increase during the Precambrian time? Choose the correct answer. Land plants evolved and released oxygen as they grew.

The chemical weathering of granite released large quantities of oxygen.

Oxygen dissolved in the ocean was released by osmosis into the atmosphere.

Cyanobacteria consumed carbon dioxide and released oxygen as a waste product.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

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.