A young girl named tatiana lives in a small village in northern russia. Her family has no access to fresh drinking water, and she must walk miles everyday to collect water from a river. Lately, However, the river has not been flowing because the Russian government has diverted it Into a hydro-electric powerplant in order to give more electricity to a large city. Now Tatiana and her family have no supply of water for themselves. this is an example of a human environmental issue known as: A) Pollution
B) scarcity
C) climate change
D) deforestation

I WILL GIVE YOU THE BRAINLIEST IF YOU ANSWER IT CORRECT AND IF YOU GET IT WRONG, I WILL REPORT IT!

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

When ash and dust begin to settle on the ground, they eventually become compacted by