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nydimaria [60]
3 years ago
11

How do you measure mineral hardness?

Biology
2 answers:
soldier1979 [14.2K]3 years ago
7 0

Answer:

You can measure mineral hardness with The Mohs' Scale.

Hope this helped :)

Alexus [3.1K]3 years ago
6 0

Answer:

To test the hardness of a specimen take it and try to scratch it with the first rock in your hardness kit, Talc. If it is scratched then the rock you're testing is hardness 1. If not then try to scratch the Talc with your rock. If the rock scratches the Talc then it is harder than the Talc.

~+ lil more info +~

nstead, common objects are used as tools to perform the hardness test:

fingernail (hardness = 2.5)

copper penny (hardness = 3)

glass plate or steel knife (hardness = 5.5)

steel file (hardness = 6.5)

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Verdadero o falso mediante el genotipo podemos determinar si existen dominancia en una característica
Murljashka [212]

Answer:

Verdadero

Explanation:

Sabemos que los caracteres dependen de los genes. Y los genes pueden presentarse en forma de alelos dominantes, o alelos recesivos. La expresión de los alelos recesivos son enmascarados o escondidos por el alelo dominante. Es decir, que si ambos alelos se encuentran juntos en un heterocigota, solo el alelo dominante se expresará.

Entonces el alelo dominante expresa la característica que resulta dominante, mientras que el alelo recesivo expresa la característica recesiva.

Genotipo:

  • Homocigota dominante ----> Expresa caracter dominante (Solo el alelo dominante esta presente)
  • Heterocigota -------------------> Expresa el caracter dominante (Ambos alelos estan presentes, pero el dominante es quien se expresa)
  • Homocigota recesivo --------> Expresa el caracter recesivo (solo alelos recesivos estan presentes)

Por ejemplo, si tenemos dos fenotipos rojo y amarillo, y sabemos que el color esta codificado por un gen dialelico llamado M. También supongamos que no sabemos qué alelo expresa qué color. Teniendo solo estos datos, no podemos decir si el rojo es el color dominante o si el amarillo lo es.

Sin embargo, si tenemos los siguientes genotipos acompañando esta información:

  • MM--> Amarillo
  • Mm--> Amarillo
  • mm --> Rojo

Recién ahora podemos deducir que el caracter dominante es el amarillo.

8 0
3 years ago
While a relatively inefficient mode of transmission, _____________ accounts for 90% of HIV infections worldwide.
Marat540 [252]

Answer:

The correct answer is - sexual transmission.

Explanation:

HIV infections can be transmitted by the various mode. Sexual transmission is one of the major mode of transmission which is comprise almost 90 % of HIV infection, according to the reports. These are relatively inefficient mode, unprotected or unnatural sex is the major mode for the HIV transmission worldwide. Cases are now comparatively less than when it was discovered due to awareness.

Thus, the correct answer is - sexual transmission.

3 0
3 years ago
Which of the following is NOT a reason why cells reproduce asexually?
sergejj [24]
Wheres the following lol
6 0
3 years ago
The points of muscle attachment are known as the
Alik [6]

Answer:

Origin and Insertion

Explanation:

The origin is the point of attachment of a muscle that remains relatively fixed during contraction.

The insertion is the point or mode of attachment of a skeletal muscle to the bone or other body part that it moves.

3 0
3 years ago
What are the Independent (IV) and the Dependent Variable (DV) in this hypothesis?
Alexeev081 [22]

Answer:

the dependent is how fast the coronavirus spreads. independent is whether the person works in a public space or not

4 0
2 years ago
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