Which type of biological agent needs a host to replicate and spread, is costly and difficult to grow in large quantities for terrorism purposes, and does not respond to antibiotic treatment?

Viruses are organisms which require living cells in which to

replicate. They are therefore intimately dependent upon the cells of the host

which they infect.

and i oop

explanation:

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.