Use the table below to answer the following question. Star Distance from Earth
Sun 15.8 x 10-6 light years
Proxima Centauri 4.2 light years
Epsilon Eridani 10.5 light years
Procyon 11.4 light years

Which of the following most likely appears brightest from Earth?
A.
Sun
B.
Epsilon Eridani
C.
Procyon
D.
Proxima Centauri

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

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).

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans