The nucleus of a call contains over a meter of dna . how can all of this dna fit inside a single cell ?

The DNA is coiled extremely tightly around proteins called histones, like a thread on a spool.  When DNA is wrapped around a a group of histones, it is called a nucleosome.

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick

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.