The all-or-nothing principle means that

a. all the nerve impulses go to the brain
b. an entire neuron depolarizes to its maximum strength
c. all the potassium ions on one side of the cell membrane move to the other side of the cell membrane
d. all the sodium ions on one side of the cell membrane move to the other side of the cell membrane

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?

Which of the following observations darwin shape his concept of descent with modification? a) species diversity declines farther from the equator.b) fewer species live on islands than on the nearest continents.c) birds can be found on islands located farther from the mainland than the birdsê¹ maximum nonstop flightdistance.d) south american temperate plants are more similar to the tropical plants of south america than to thetemperate plants of europe.e) earthquakes reshape life by causing mass extinctions.

Which is an example of precipitation. 1snow 2clouds 3natural gases 4organic matter