The figure below shows strong hydrogen lines in the same portion of the spectra for three stars with the same temperature.   (A) (3 points) Identify Identify EACH spectrum by its luminosity class: Supergiant (I), Giant (III), Main Sequence (V)  (B) (4 points) What is the name of the primary mechanism responsible for the broadening of the spectral line and briefly (few words only) explain the underlying source of the broadening mechanism.  

In mutualism, one organism is ________________, and the other organism is ________________.

La rutina diaria.   The Soriana family’s house is a very busy place. In order to understand their daily activities, complete the sentence writing the missing reflexive pronoun and the appropriate conjugation  in the blank space like the model. MODELO         Nosotros ____________(acostarse) a las  11:00 de la noche.                           Correct answer: nos acostamos   Miguel ______________(acostarse) a las ocho de la noche.

If a star has an absolute magnitude of M=5 and an apparent magnitude of m=5, then its distance is

A cluster has 5 stars all of which are equally distant.  The 5 stars are a K main sequence star, a K giant, a M main-sequence star, a G white dwarf and a G main sequence star. Which star is brightest?

Tenemos que ir a la clínica   Complete the paragraph with the correct form of ser or estar. Pay attention to context to know which verb is necessary. Copy & paste these special characters if needed:   á      é      í      ó      ú   Tomás y Gerardo  [A] hermanos. Ahora [B] en la clínica y [C] un poco nerviosos.  El doctor Marichal [D] su médico. [E] simpático y muy inteligente. Tomás y Gerardo no [F] enfermos, pero hoy [G] el día de su chequeo anual (annual checkup).

¡Prepárate!   Ramón’s housemates are helping him clean and prepare for a party. He tells them what they need to do. Complete his statements with the appropriate form of the verbs in parentheses as informal commands. Do not capitalize.  “Humberto, ____________________ (sacar) la basura, por favor”.

Think carefully. Which of the following groups feed on all of the other groups?

Use the following scenario to answer questions 22-24. Chemical X was used widely in the United States as an insecticide for many years. Eventually, research showed chemical X was a persistent chemical that bioaccumulated and biomagnified in the environment. The chemical was later banned from use in the United States. Chemical X was used to kill insects but was found to also affect birds by disrupting hormonal processes. This chemical is a(n) ________________.

One essential feature in hypnosis is that: