In general, sympatric speciation requires the action of selection acting against hybrids.

disruptive

Explanation:

Sympatric speciation is a speciation (evolution of new species) that occurs when one group of population becomes isolated, but stays in the same geographic location as the rest of the population. Through time, these two group evolve independently and become different species.

The model that shows this type of speciation involves disruptive selection: homozygous individuals are favoured over heterozygous in a population, which leads to speciation.

The last option is correct.

Explanation:

An emission spectrum is that obtained by passing a white light, such as that of the Sun, or of the flame of another element (oxygen, in this case), by a prism and a discontinuous spectrum is obtained. Absorption is when the continuous spectrum passes through another gas and causes the presence of dark lines.

In the case of the options provided, most likely the oxygen emission spectrum is that shown in the last option. This is because, the light pattern, shown in this option is what most resembles the light pattern of the oxygen absorption spectrum.