16. How do endophytes affect grazing animals? A. Endophytes are poisonous to plants, depriving grazing animals of forage
B. Endophytes that produce toxins can be poisonous to grazing animals,
C. Endophytes pull nutrients from the soil making plants more nutritious for grazing animals.
D. Endophytes fix nitrogen from the air making plants more nutritious for grazing animals

A. Endophytes are poisonous to plants, depriving grazing animal of forage

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.