Which of the following oxides is strongly basic?

Which animal group possesses a pseudocoelom?

If a breeder wants to introduce a disease-resistant strain, what should be the first step?

$A$ vertical $U-$tube of uniform inner cross-section contains mercury in both sides of its arms. $A$ glycerin (density $= 1.3 \ g/cm^3$) column of length $10 \ cm$ is introduced into one of its arms. Oil of density $0.8 \ g/cm^3$ is poured into the other arm until the upper surfaces of the oil and glycerin are in the same horizontal level. Find the length of the oil column. (Density of mercury $= 13.6 \ g/cm^3$) (in $cm$)

What is the primary purpose of data entry in the context of mathematical research?

In what ratio does the $y-$axis divide the line segment joining the points $(-3, -4)$ and $(1, 2)$?