There is a correlation between algae height and the snout-to-vent length of a group of marine iguanas in the galapagos; as algae height increases for a given island, so does iguana length. why would the body size of this population of iguanas correlate with algae height? differential reproduction of larger animals is favored when adequate nutrition is supplied by larger algae. increased variation in animal size is favored when large plant species are present in a healthy ecosystem. overproduction of smaller animals is favored when algae swards are short and vice versa when algae swards are long. traits are exchanged between iguana and algae populations so that taller algae result in larger iguana populations.

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).