I rly need help fasttt b) Would it be common to find two organisms that had a relationship that could be described as both parasitism and commensalism? (2 points)

7. Look at the energy pyramid below.

a) The size of each level describes how much energy is available at each trophic level. Is this an example of a healthy ecosystem or an ecosystem that may not be able to continue existing? Explain. (3 points)

b)Why are there always fewer secondary consumers in an ecosystem than primary consumers?

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).