The diagram shows a food web in a grassland.

A diagram of a food web is shown. Arrows are drawn from grass to grasshopper, grass to squirrel, grass to mouse, grasshopper to the lizard, grasshopper to hawk, squirrel to hawk, mouse to snake, mouse to hawk and snake to hawk.

What best describes the role of the mouse in the food web?

Group of answer choices

A primary consumer that is food for the snake and hawk

A secondary consumer that is food for the snake and hawk

A primary consumer that is food for a single predator, the snake

A secondary consumer that is food for a single predator, the snake

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).