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A species with an unpaired electron, that is very reactive. For example, oxygen radicals involved in ozone depletion.

The time taken for half of a given amount of radioactive substance to decay.

In prophase I of meiosis, homologous, non-sister chromatids form connections called chiasmata at matching loci. The complex then splits to give chromatids with different combinations of genes than were pr...

(i) To find the gradient of a straight light, we take any two (different) points on the straight line and compute the change in Y divided by the change in X. So here this is; (21-3)/(9-0) = 18/9 = 2. So t...

= x(1-4x^2)From difference of two squares method,= x(1-2x)(1+2x)