(optional) EXTRA CREDIT QUESTION (worth 2 points).  Respond to only ONE of the questions below.  If more than one response is written, I will only grade the FIRST response. Explain why some say we are experiencing the 6th mass extinction? Be detailed; it must be clear based on your answer that you understand what constitutes an extinction and the specific factors that are contributing to this 6th mass extinction. Describe the steps associated with arctic amplification. Explain the connection between mosquitoes, feral hogs, birds, and climate change (in Hawaii). Explain what happened when wolves were reintroduced to Yellowstone National Park (as explained in the video in Module 4).

What percentage of energy is transferred when an organism eats another organism at the trophic (feeding) level just below itself?

The three different types of biodiversity discussed were:

What is the best definition of “ecosystem services”?

Which of the following statement is FALSE regarding synaptic transmission of dopamine and its role in learning

Which of the following statements is FALSE regarding synaptogenesis and synaptic pruning?

I VERBI RECIPROCI al presente. Fill in the blanks with the appropriate conjugation in the present tense of the verb in brackets.    Rita e Giorgio (conoscersi) da molti anni, ma non (vedersi) spesso perché Rita lavora a Milano e Giorgio a Roma. Quando sono lontani (scriversi) email e (telefonarsi) spesso. Loro (mandarsi) anche tante messaggi. Quando (incontrarsi) dopo tanto tempo, (abbracciarsi).

IMPERFETTO vs PASSATO PROSSIMO. Look at the context clues and choose the right option.   Mentre tu ___________, io guardavo la tv.

RIFLESSIVO/RECIPROCO OR NOT? Choose the right verb in each sentence according to its meaning   I miei cugini _______________ a calcio per la loro scuola.

CI or NE?  Fill in the blanks with either CI or NE, according to the meaning of the sentence.    – Da quanto tempo abiti in Sicilia? _________ abito da dieci anni.