Which part of the world has a high density of organisms?

Genus represents

$\sim (p \vee q)$ is equal to

Why are modern techniques implemented in fisheries?

An archaeologist analyses the wood in a prehistoric structure and finds that the ratio of ${C^{14}}$ (half-life $= 5700 \, years$) to ${C^{12}}$ is only one-fourth of that found in the cells of living plants. The age of the wood is about ........ $years$.

The electronic configuration of $Yb^{2+}$ is: