What type of organism did Skou use to study the sodium potassium pump because they had large nerve fibers? a) Rats

b) Human

c) Lady bugs

d) crabs

please help <3

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.