Answer:
The four nitrogenous bases
Helpful Tip:
To know which base goes with which
Remember
Car in the Garage
<em>Cytosine and Guanine</em>
and
Apple in the Tree
<em>(Adenine and Thymine)</em>
The answer is <span>c. One that is most easily affected by changes in water quality.
An indicator species is a biological species whose presence or absence and even abundance can indicate specific environmental conditions. For example, there are some species (plant, fish, invertebrates,...) that can live only in an extremely clean river. But, if that clean river gets polluted by human activity, the river will not be any long extremely clean, and sensitive species will not survive and will disappear from the river. Its absence will indicate that river quality is threatened.</span>
Answer:
Option C, As elevation increases, air pressure decreases, molecules spread out, and air temperature cools.
Explanation:
As we move towards the sky the number of air particles reduces and hence its density also reduces. Due to lesser number of particles the pressure exerted by air also reduces at high elevations.
As per the gas law
![PV = nRT](https://tex.z-dn.net/?f=PV%20%3D%20nRT)
Where P is the pressure, V is the volume, n is the number of mole, R is the gas constant and T is the temperature.
Gas law states that if volume is constant, the relation between temperature and pressure is proportional.
Thus, if pressure is reducing the temperature will also reduce.
Hence, option C is correct