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When an action potential from a motor neuron arrives at the neuromuscular junction, a series of events occurs that leads to the contraction of the skeletal muscle cell. Which of the following events occurs last?  (Hint: put these events in the correct order first, so you can easily decide which event occurs last.)

During an action potential, the local axon membrane repolarizes from +40 mV to -75 mV because of:

A tsunami hits a small island and all snakes in a population are killed except for a small number of individuals. Today, the population has recovered in size but has lower genetic diversity compared to the population that existed before the tsunami event. Which concept best describes this scenario?

Which of the following is TRUE about the underlying premises of phylogenetics?

The image below is a chameleon using its color to blend in with its environment to protect itself from  potential predators.  What type of mechanism against predation does this illustrate?

Toxic chemicals from factories dumped into the ocean makes marine organisms sick and leads to a decline in biodiversity.  What kind of threat to biodiversity is this?

You learned about different dispersion patterns.  Examine the image of a dandelions in a field.  Use the word bank included to answer the fill-in-the-blank question below. Word bank: assorted, clumped, divergent, homologous, random, uniform The dandelions in the field exhibit a(n) _____________ dispersion pattern.  

The image below is lichen, which is an example of mutualistic symbiosis because _________      

The image below is lichen, which is an example of mutualistic symbiosis because _________      

You learned about different dispersion patterns.  Examine the image of a school of fish.  Use the word bank included to answer the fill-in-the-blank question below. Word bank: assorted, clumped, divergent, homologous, random, uniform The school of fish exhibits a(n) _____________ dispersion pattern.