1. step 1 nebular cloud of gas and dust. 2. step 2 3. step 3 4. step 4 other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened, disk. nuclear energy runs out; death, possible supernova condensed material begins to combine and form a core center. as it warms, a protostar is formed. cloud collapses under the force of its own gravitational attraction, usually triggered by a supernova stellar core heats as it grows: nuclear fusion begins and a star is born. 5. step 5 6. step 6

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

because photosynthesis could not occur (apex)