Nutrients enter a cell with the concentration gradient by the process of diffusion.
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Metals are known to be excellent conductors of electricity, however some metals do not conduct electricity as well as gold, copper or sliver (examples of good conductors). Metals such as lead, mercury and alloys of iron, chromium, titanium and stainless steel do not conduct electricity as good as silver, copper and gold. It is also important to note that all gases do not conduct electricity at all due to the great amount of space between its electrons.
Answer:
D. imprints of organisms known to have lived during a specific time period
Explanation:
The index fossils are very useful to the geologists. These fossils are only found in specific time period. They are also found on lot of locations around the globe, and they are in big numbers. Because of these characteristics, the index fossils are excellent for determining the relative age of rock layers, or other fossils, as they offer the basic information that are needed for this. This type of fossils tend to be small or medium sized ones, as usually the larger organisms do not have very large populations.
Answer:
c.
Explanation:
They serve as a short-term energy source for the body.
