Seaweeds such as kelp are a potentially renewable source of biofuels for both electric power generation and as a replacement for petroleum-based products. which of the following is a potential issue that could change this potentially renewable resource into a nonrenewable one? - a kelp forest could become too plentiful and expand out of the forest boundaries. - kelp might not be able to produce enough foliage for biomass demand. - the kelp might not be able to replenish fast enough once depleted. - a kelp forest could produce too much oxygen for the environment to process.

What percentage of light hits earth's surface directly?

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).

The two main stages of cell division are called