Which stage happens first in the life cycle of a middle-latitude cyclone?

The main weather producers in the mid-latitudes are wave cyclones or mid-latitude cyclones. These are the systems of low pressure, which travel towards the east from west and remains for a week or even longer. The life-cycle of a mid-latitude cyclone can be differentiated into six stages, of which the initial stage is the stationary front with the opposing shear across the front.

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.