What is apoptosis?
a. a pathological condition observed only in damaged or diseased organisms
b. an experimental technique used to kill specific cells
c. a developmental mechanism unique to the roundworm c. elegans
d. programmed cell death that is required for normal development

The correct answer is option D.

Explanation:

Apoptosis is a way of programmed cell death that takes place in all the multicellular living beings. This type of the cell programmed leads to the characteristic change and the death of the cells due to biochemical events that took place in cell.

These process is important in multicellular organism to grow normally by change and death of aged or damaged cells. The change that take place in this process are nuclear fragmentation, cell shrinkage, chromatin condensation and other cellular changes.

Thus, the correct answer is option D.

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.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.