Which is considered to be a scientific theory? a) how gravity works b) the fact that gravity exists c) the fact that gravity is necessary d) the idea that gravity is part of physical science

The correct answer will be option-A

Explanation:

A scientific theory is a statement which explains the natural phenomenon and events in-depth.

The scientific theory explains how and why the process is taking place which is based on the accumulation of multiple hypotheses and the experiments performed to test the hypothesis.

In the given question, an option which asks how the gravity works in nature can be explained in the theory and thus option-A is the correct answer.

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