UNAM -> MATEMÁTICA SIMULADOR PARA LA UNAM
UNAM -> ESPAÑOL SIMULADOR PARA LA UNAM
Pararra_os zambu_ir sosla_o ho_o patru_a.
La opción que completa correctamente a las palabras es
UNAM -> FISICA SIMULADOR PARA LA UNAM
UNAM -> FISICA SIMULADOR PARA LA UNAM
Inglés
Choose the correct answer for each question according to the information in the text. Each line is numbered to help you identify them quickly.
| Sunflowers Make Bees Poop—a Lot. Here's Why That's Good | |
|---|---|
| Paragraph | Text |
| [1] | Bumblebees and other pollinators face many threats, including pesticide exposure, |
| [2] | climate change, habitat loss due to agriculture and development, and pathogens |
| [3] | that ravage multiple species. But a recent finding may help lighten their load. |
| [4] | Previous studies have shown sunflower pollen can work like a medicine for |
| [5] | bumblebees afflicted by a parasite called Crithidia bombi, a single-celled organism |
| [6] | that takes up residence in the bee's gut [and harms their health]. But scientists couldn't |
| [7] | explain how sunflower pollen vanquished C. bombi—did it boost the bees' immune |
| [8] | function, or perhaps poison the parasite directly? |
| [9] | New research, published in the Journal of Insect Physiology, shows the answer is |
| [10] | deceptively simple. "Sunflower pollen makes bumblebees poo a whole lot," says lead |
| [11] | author Jonathan Giacomini, which flushes the parasite out. |
| [12] | Plant products like nectar and pollen are a treasure trove of potential insect medicines |
| [13] | that scientists are just beginning to understand, he adds. "There are natural things out |
| [14] | there that bees are interacting with that can be beneficial for them," Giacomini says. |
| [15] | And by making changes to the landscape, scientists hope we can help give bees a |
| [16] | fighting chance. |
| [17] | Plant power |
| [18] | If you happen upon a fuzzy, buzzing, flying creature in eastern North America, there's |
| [19] | a strong chance it's a common eastern bumblebee (Bombus impatiens). Yellow and |
| [20] | black striped with a rump covered in soft hairs, they're social insects that live in |
| [21] | colonies and love a good crevice—they build their homes in birdhouses, woodpiles, |
| [22] | abandoned burrows, and dense grasses. |
| [23] | [They] are important pollinators, both in the wild and in agriculture, where they're raised |
| [24] | and used to pollinate crops including tomatoes and pumpkins. Like other pollinators, |
| [25] | bumblebees face many threats, and C. bombi isn't even the biggest bumblebee |
| [26] | bugaboo. On its own, the parasite doesn't have much of an effect on a bumblebee's |
| [27] | health. But when food is scarce, C. bombi can shorten a bee's lifespan and even |
| [28] | reduce the number of young queens a colony can produce. |
| [29] | Lynn Adler is an evolutionary ecologist at the University of Massachusetts Amherst |
| [30] | who studies interactions between plants and insects. For years, she and longtime |
| [31] | collaborator Rebecca Irwin at North Carolina State University suspected pollinators |
| [32] | might be getting dosed by flowers since plants often invest chemically active |
| [33] | compounds into their nectar and pollen to help their genetic payload arrive at |
| [34] | its destination. |
| [35] | "Many plant defensive compounds can be medicinal at certain doses," Adler says. After |
| [36] | all, "most of our human medicines come from plants." |
| [37] | Giacomini discovered the effect of sunflower pollen as an undergraduate working in |
| [38] | Adler's lab in 2018. From [these] very first tests, sunflower pollen dramatically reduced |
| [39] | C. bombi parasite load in common eastern bumblebees, often clearing infection |
| [40] | completely. "We've been shocked at how consistent and effective sunflower pollen |
| [41] | has been," Adler says. |
| Elizabeth Anne Brown, National Geographic | |
In line 25, the word face refers to the...
Exani II, Exani II -> Comprensión Lectora
Lea el texto y responda las preguntas asociadas.
El sabio que tomó el poder
[...] El Mono hizo aún otro descubrimiento sensacional: la injusticia de que el León, que contaba únicamente con su fuerza y el miedo de los demás, fuera su jefe; y él, que si quisiera, según leyó no recordaba dónde, con un poco de tesón podía escribir otra vez los sonetos de Shakespeare, un mero subalterno.
A la mañana siguiente, armado de valor y aclarando una y otra vez la garganta, durante más de una hora expuso al León con largas y elaboradas razones la teoría de que de acuerdo con la lógica más elemental, los papeles debían cambiarse, pues para cualquiera con dos dedos de frente era fácil ver cómo lo aventajaba en descendencia y, por supuesto, en sabiduría.
El León, que intrigado por el vuelo de una mosca en ningún momento había bajado la vista del techo, estuvo conforme con todo, en ese mismo instante le cambió la corona por la pluma y, asomándose al balcón, anunció el cambio a la ciudad y al mundo.
De ahí en adelante, cuando el Mono le ordenaba algo, el León, siempre de acuerdo, asentía invariablemente con un zarpazo; y cuando el Mono lo regañaba por alguna orden mal entendida o por un discurso mal redactado, con dos o tres; hasta que, pasado poco tiempo, en el cuerpo del nuevo rey, o sea el Mono sabio, no iba quedando sitio del que no manara sangre o cosas peores.
Por último, el Mono, casi de rodillas, rogó al León volver al anterior estado de las cosas, a lo que el León, aburrido como desde hacía mil años, le respondió con un bostezo que sí, y con otro que estaba bien que volvieran al anterior estado de cosas, y le recibió la corona y le devolvió la pluma, y desde entonces el Mono conserva la pluma y el León la corona.
Augusto Monterroso
El texto tiene como propósito _______ los valores que rigen al mundo.
Exani