If the same index fossils are found in two separate rock layers, the two rock layers most
a. reveal a disconformity.
b. reveal a nonconformity.
c. were formed at the same time.
d. were formed at different times.

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).

How do the sperm cells get from the stigma to the ovules?

What two factors does carrying capacity compare? population size and resource use population growth and resource availability resource use and time population size and time