Which question is not answered by the article? А
Why are scientists with the National Park Service especially interested in lichen?
B
How did Buhler and other world-class climbers help scientists with the project?
с
When do scientists expect to finish their list of Yosemite's biology?
D
How many unfamiliar lichen species did rock climbers and scientists find in Yosemite
Park?

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.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.