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harkovskaia [24]
3 years ago
13

A geologist discovers a sample of fine-grained rock made up of very small crystals. Based on its physical appearance, what can t

he geologist conclude about the rock?
A. It formed from magma that cooled slowly.
B. It formed from the remains of living organisms.
C. It formed from materials produced by living organisms.
D. It formed from magma that cooled quickly.
Biology
1 answer:
tensa zangetsu [6.8K]3 years ago
3 0

Answer:

D. It formed from magma that cooled quickly

Explanation:

From several experiments, geologists have come to terms with the fact that when magma cools rapidly, it does not give room for large and big sized crystals to form. Instead, tiny, little crystals would be formed.

For example, obsidian and most volcanic rocks.

When a magma has enough time to cool and solidify, we see very big crystals of minerals in them.

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T/F the respiratory tract has multiple systems to help protect against airborne diseases. which of the following summarizes some
svetlana [45]

A mucociliary blanket to remove contaminants, secretion of lysozyme and other antimicrobial chemicals, and alveolar macrophages helps protect against airborne diseases.


Respiratory aerosols spread airborne infectious disease within infected individuals and between the infected individuals and their environment
Airborne diseases are caused by pathogenic microbes small enough to be discharged from an infected person via coughing, sneezing, laughing and close personal contact or aerosolization of the microbe. The discharged microbes remain suspended in the air on dust particles, respiratory and water droplets.
Some of the common pathogens that may spread via airborne transmission are:
Anthrax.
Aspergillosis.
Blastomycosis.
Chickenpox.
Adenovirus.
Enteroviruses
.

To know more about diseases click here
brainly.com/question/934133

#SPJ4

8 0
1 year ago
En el hombre el color negro de los ojos “A” domina sobre el color azul “a” Una pareja en la que el hombre tiene los ojos negros
umka21 [38]

Las respuestas a estas preguntas son:

a) Genotipo del padre Aa (ojos negros)

b) Cruzamiento: Aa (padre) x aa (madre)

c) Frecuencias genotípicas esperadas: 1/2 Aa; 1/2 aa  

En genética, dominancia completa se refiere al proceso  de herencia en la cual un individuo heterocigota, es decir, el individuo que presenta dos alelos diferentes para el mismo gen, presenta el mismo fenotipo que un individuo homo-cigota para el alelo dominante (el alelo dominante es aquel que enmascara la expresión del alelo recesivo en individuos heterocigotas).

En este caso, el carácter 'color de ojos' presenta un patrón de herencia monogénica, donde el alelo 'A' dominante codifica para el rasgo fenotípico ojos negros, mientras que el alelo 'a' recesivo codifica para el rasgo fenotípico ojos azules.  

En el ejemplo, la pareja tuvo progenie en la cual uno de los hijos presenta el rasgo recesivo ojos claros, con lo cual el padre debe ser heterocigota y poseer un alelo recesivo 'a'; mientras que la madre expresa el fenotipo recesivo y por lo tanto su genotipo es 'aa'. En consecuencia, el cruzamiento de un padre heterozigota 'Aa' con una madre homo-cigota recesivo 'aa' producirá una descendencia con una frecuencia genotípica esperada de 1/2 (50%) de hijos con ojos 'color negro' de genotipo Aa y 1/2 (50%) de hijos con ojos 'color celelste' de genotipo aa >>

Cruzamiento: Aa (padre) x aa (madre)

Gametos padre: 1/2 A; 1/2 a

Gametos madre: 100% a

Cuadro de Punett (combinaciones gaméticas):

                  A           a

a               Aa          aa

a               Aa          aa

En consecuencia,  este cruzamiento producirá 50% individuos ojos color negro (genotipo Aa) y 50% individuos con ojos color celelste (genotipo aa)

Podés encontrar más información sobre este tema en:

brainly.com/question/22398195?referrer=searchResults

7 0
3 years ago
Some present-day bacteria use a system of anaerobic respiration characterized by an electron transport chain analogous to that f
geniusboy [140]

Answer:

The correct answer would be:

Neither of these response options accurately features the anaerobic electron transport chain.

Explanation:

The anaerobic respiration system vibrated by an electron transport chain is a mechanism that anaerobic bacteria have to maintain their respiration.

This mechanism does not require oxygen in the atmosphere, that is why it is said to be an anaerobic mechanism.

Bacteria do not all need oxygen in the environment to live, some need that oxygen is not exactly present (strict anaerobes) or that it is at low partial pressures (facultative anaerobes).

This mechanism is very characteristic in its location since it is located in the inner membrane of the mitochondria, that is why it will decide to indicate that option as the correct one.

6 0
3 years ago
What is the function of mitochondria in cells? A. They make proteins from instructions created and sent by the nucleus. B. They
hram777 [196]

D. They convert glucose into another form of energy used by cells.

5 0
3 years ago
Read 2 more answers
Plz help cause I don’t think this isn’t right at all
melamori03 [73]

Answer:

From left to right side

Explanation:

Diffusion is the process in which molecules move from a place of higher concentration to a place of lower concentration until a point comes when the concentration of the molecules is balanced in the both areas.

Now, if we look at the diagram, we see that molecules are highly concentrated on the left side, and next to that side is a semi permeable membrane through which they are getting diffused into the right side of the cell.

So, looking at it, it is very clear that molecules will move from left side (the most concentrated side) to te right side (the less concentrated side).


Hope it help!

8 0
3 years ago
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