I thinking A. or B. but im sure it one of them. that's a 50% chance.
<span>A) Viruses are not alive. - yes they are alive, dead viruses are used in vaccines
B) Viruses have no protective shell. - yes, they have
C) Viruses have no lytic cycle. - this is specfic for bateria
D) Viruses do not contain DNA. - every virus contain a DNA!
your answer is C</span>
The
two categories that are used to classify physical changes are Reversible and
Irreversible.
Reversible
means that the matter can convert to gas, liquid and solid and then convert
back to gas, liquid or solid. So it means it can convert back and forth.
<span>Irreversible
means that matter cannot be converted back as it is before.</span>
B. atmosphere since the atmosphere is made up of o2, co2 (a greenhouse gas) and nitrogen. those are the primary elements
