the answer to this question is solar system, earth is a singular planet, galaxy contains stars but does dot orbit around a central star, and the sun is a star
<u>Answer:</u>
<em>Atomic clock doesn’t contain decaying isotopes.
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<u>Explanation:</u><u>
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It is the <em>decay of radioactive elements</em> that emit radiations and most of these are harmful to life. But atomic clock doesn’t work on the principle of atomic decay. There is no atomic decay occurring in an atomic clock and thus there is no <em>harmful radiation being emitted from the atomic clock</em>.
Caesium atomic clocks, rubidium atomic clocks etc are some of the atomic clocks. The working principle of atomic clocks is the transition of atoms between various energy levels.
The <em>frequency of Electromagnetic signal</em> emitted during transition of atoms to higher energy levels is the basic factor that determines the working and <em>efficiency of an atomic clock.
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<span>A solution is hypertonic to a cell if it has a higher solute (dissolved substance) concentration than the cell does. As a result, it also has a lower concentration of water than the cell does. Cell membranes and plant cell walls are semipermeable barriers, which means that certain molecules can diffuse through them, while other molecules can not.</span>
Resources in a lake can change due to climate changes. Changes in climate may affect the survival, growth and reproduction capabilities of frogs and other amphibians. Climate changes greatly influence food availability, predator-prey relationships and competitive interactions which can alter community structure.
Changes in lakes can include other factors such as UV-B radiation and contaminants.These factors are complex and are causing some amphibian population to decline or even extinct.
Hence, as a result the frog population could exhibit a decline in population.
