Which statement best summarizes the water cycle?
as water moves through an ecosystem, its energy is lost between the trophic levels.
water in the atmosphere must be converted to another chemical before animals can use it.
the water on earth changes forms as it moves from one reservoir to another.

Option C

Explanation: The water cycle can be defined as the cyclic movement of water from one place to another in different forms is known as water cycle.

The water falls from the sky(precipitation) in the sea, ocean, lakes, glaciers and snow. When the temperature rise the water evaporates and goes into sky  and deposits in the clouds by the process of condensation.

This water falls again in the form of rain or snow back on to the earth, this cycle continues. The water changes from one form to another as it changes its places from clouds to earth and back from the earth to clouds.

the cell theory states that all living things including animals, as well as plants, are made of cells.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.