You can eat many organisms. What do you mean by this?
Longitudinal is the sliced area
Cross section is the chopped area
When a lineage splits into multiple line of descents, then, it leads to speciation. It is a process by which a single population evolves into different species. The process of speciation leads to the development of two or more species as the lineages are splitted. These two evolved species are genetically independent.
Hence, the blank can be filled with 'speciation'.
Answer c . ;a and t, c and g
Things like fungus and bacteria there is no set trophic level for them and their niche is to break down dead plants and animals or even waste ( poop)