Answer:
The 2 ml and 2.0 ml is the same thing.
It could them know how it start when it started wats in the infectious disease and why
Answer:

Explanation:
Given,
The density of Helium is 
We need to find the density in Dg/μm
We know that,
1 g = 10 dg
1 cm³ = 10¹² μm³
So,

So, the density of Helium is equal to
.
Answer:
Calcium cyanamide
Explanation:
I think it has to be calcium cyanide, because of the cyanamide ion (CN).
If the results of the experiment on repeating are not same, it shows the results are not standard, there are some factors, which are not constant