True or false? niacin is crucial to dna synthesis and cell division, amino acid metabolism, and the maturation of red blood cells and other cells.
select one:
true
false

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.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

there are no options but this may your question,

leaves enable photosynthesis to occur. photosynthesis is the process by which leaves absorb light and carbon dioxide to produce glucose (food) for plants to grow. leaves are adapted to perform their function, eg they have a large surface area to absorb sunlight.

hope this !