The answer of the absolute refractory period is 3.5
2 + 9x = 20
2 - 2 + 9x = 20 - 2
9x = 18
9x/9 = 18/9
x = 2
Amount of rainfall
I’m not sure if this is right but I think it is because all of the rest are major parts of ecosystems, and although rainfall is too, it’s more of a natural source that happens anywhere whereas the rest of the options may determine the ecosystem
No she needs to collect more data like for example have them run 60 meters and then 90 meters then take the average of the dog and cats time
Answer:
D
is the answer because as you see the percentage increase