The answer is B. because Richter's scale is <span>a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations. </span>
Answer:
They use them so that they can see what type of organisms live there.
Explanation:
<span> Biotic components or biotic factors are any living organisms that affect another
organism. These components shape an ecosystem which includes animals that
consume organisms in question and its living food that the said organisms
consume. Biotic components include human influence. Producers, consumers and
decomposers usually comprise biotic components.</span>
<span> </span>
A DNA molecule consists of two strands of nucleotides twisted together to form a double helix. The sugar-phosphate backbone is found on the outside of this helix and the bases are found braching towards the middle. Hydrogen bonds join the thenitrogenous bases and hold the two strands together.
Therefore your answer is sugar and phosphate.