Administración
¿A qué etapa de la planeación corresponde la determinación del número de equipos de cómputo necesarios para una nueva oficina?
Redacción indirecta
Elija la opción que tiene un significado opuesto a la palabra resaltada con negritas.
El profesor nos dijo que el diccionario que estamos usando es viejo y que varias de las definiciones en él son obsoletas, por lo que nos recomendó una lista de diccionarios para comprarlos esta semana.
HISTORIA UNIVERSAL SIMULADOR PARA LA UNAM
Selecciona los inventos científico-tecnológicos más importantes del Siglo XIX
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 | |
Match the information given with the information in the text.
| Information given | Information in the text |
| 1. Lynn Adler 2. Eastern bumblebee 3. Rebecca Irwin 4. C. bombi 5. Jonathan Giacomini |
a) A yellow and black striped insect b) A single-celled organism c) An evolutionary ecologist at the University of Massachusetts d) A researcher at North Carolina State University e) A researcher who published in the Journal of Insect Physiology |
Ciencias sociales
Identifique a uno de los autores representativos del materialismo histórico.
FISICA SIMULADOR PARA LA UNAM
Un cuerpo por la gravedad genera un peso w, el cual a su vez genera una presión sobre el piso. ¿cómo se le puede llamar a esa presión?
HISTORIA UNIVERSAL SIMULADOR PARA LA UNAM
Elige cuales fueron las consecuencias de la Segunda Guerra
Mundial.
I. La ocupación de los países vencidos.
II. Las violaciones al tratado de Versalles.
III. La formación del Eje Berlín-Roma-Tokio.
IV. La división de Alemania en cuatro zonas de
ocupación.
V. La invasión de abisinia por parte de Italia.
VI. El fracaso de la sociedad de naciones.
Exani