Ascientific theory that seeks to understand relationships between all organisms, both alive and dead is

Evolution

Explanation:

Evolutionary studies are very essential in understanding the relationship between a species in present time and its ancestors. The fossils derived from various researches help scientist to understand how a specific organism has evolved with the changing environment conditions.

Evolutionary studies link the morphology, anatomy and physiology of any living organism with its ancestors to understand the circumstances under which these changes have occurred and also predict how further changes will occur in near by future.

a symbiotic relationship with the mitochondria

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle