The total amount of water on earth
a. is increasing.
b. is fairly constant.
c. is decreasing.
d. depends on the weather.

The correct answer is fairly constant.

The total amount of water on the earth remains fairly constant on the earth. The regulation of the mount of water on earth is maintained by the water cycle.

The water from the seas, ocean and other water bodies gets evaporated and gets stored in the clouds that comes down to the earth in the form of precipitation.

Through water cycle the amount of water on earth is fairly constant.

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

the answer is d p: cell, q: organ, r: organ system, s: tissue