In addition to paleomagnetism, what other evidence was needed to determine the rate of seafloor spreading?
a the strength of the magnetic field
b the age of each strip of rock
c minerals in the rocks
d the thickness of the rock layers
what causes the earth’s magnetic field?
a currents in the earth’s liquid-metal outer core
b magnetic particles located at the earth’s poles
c molten material in the mantle
d the mineral composition of the earth’s crust

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants

Which of these transport mechanisms moves glucose from the blood into a cell? active transport diffusion facilitated diffusion osmosis

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).