Vascular plants, such as pine trees, are usually much larger than non-vascular plants, such as mosses. which of the following is the best explanation for this difference?

vascular plants can only transport water from one cell to the next cell.
non-vascular plants can transport water in tube like structures called xylem and phloem.
vascular plants can transport water in tube like structures called xylem and phloem.
non-vascular plants transport water only in their roots.

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).