Which of the following is true about the distribution of water in the hydrosphere? A.
The amount of water in the hydrosphere remains constant.
B.
None of these is true.
C.
The amount of water in the hydrosphere significantly decreases over time.
D.
The amount of water in the hydrosphere significantly increases over time.

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).