Which of the following is not a step in the evolution of a star? a. supergiant c. supernova b. red dwarf d. neutron star

A. Supergiant .

Stars start as a neutron star, turn to a red dwarf as they progress, then explode in a supernova.

Explanation:

As the main series star glows, hydrogen in its core is transformed into helium by nuclear fusion. ... In the core of the red giant, helium blends into carbon. All stars grow the same way up to the red giant phase. The amount of mass a star has decided which of the subsequent life cycle routes it will take from there.

Following are the steps in star cycle

WHITE DWARF

SUPERNOVA

NEUTRON STARS

BLACK HOLES

yes? sounds right, but you didn’t ask a question.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.