Changes in pH change the attractions between the groups in the side chains of the protein.
Answer:
B.
Explanation:
most valleys are weathered by running water. Glacier can also weather these. Because of running water it will carry the weathered pieces away.
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Answer: mutations that natural selection can work on. 4.) How do scientists calibrate a molecular clock? ... they compare the number of positive mutations that have occurred in a particular species with the number of negative mutations that have occurred
Explanation:
The correct answer is B) decreases; more difficult.
Unicellular organisms such as <em>Amoeba</em>, <em>Paramecium</em> depend on diffusion to move substances into and out of the cell. The surface area of unicellular organisms is large compared to its volume. Therefore, nutrients and other substances can easily cross the membrane and around their body.
As a cell's volume grows, its surface area/volume ratio <u>decreases</u>, making it <u>more difficult</u><u> </u>to acquire enough nutrients via diffusion.