As the fruit develops, why do the petals, stamen, and sepals fall off?

Petals, stamen, and sepals fall off because they are no longer needed by the plant.

Explanation:

Petals, stamen, and sepals are closely related to plant reproduction. Petals protect the reproductory parts of the plant and because the fruit needs to be funded by pollen they no longer need reproductive parts, they have achieved it and now are in the development stage to mature and provide seeds and create more plants. Stamen and sepals are the reproductory parts of the plant and they are no longer needed o achieve reproduction

the dark variety, as they are not visible on the dark tree barks

explanation:

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