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vesna_86 [32]
3 years ago
14

Which of these is the best method to measure the distance of a star

Biology
2 answers:
Sergeeva-Olga [200]3 years ago
4 0
I think the correct answer would be the first option. The best method to use in order to measure the distance of  star would be to calculate the variations in the position of the star due to movement of Earth in its orbit. The doppler shift which is what is being described in the last three options does not calculate the distance rather it calculates the relative velocity. The method used in measuring the distance was introduced by Edwin Hubble where he found that relative velocity of a body in space is directly proportional to the distance of that body from Earth.
vovikov84 [41]3 years ago
3 0

Answer:

calculate the variations in the position of the star due to movement of Earth in its orbit

Explanation:

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you discover a certain species of weed growing in soil contaminated with toxic pcbs, and later determine that the pcb resistance
hammer [34]

Answer:

f(R) = p = 0.1

Explanation:

Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
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2 years ago
A part of the cytoskeleton of a cell, formed in prophase (in mitosis) or in prophase i (in meiosis), from which extend fibers th
Westkost [7]
The correct answer is "spindle apparatus" or "mitotic/meiotic spindle" or just "spindle". The spindle is a structure made of microtubules wherein it acts to separate the sister chromatids from the daughter cells, eventually separating chromatids from one pole to the other.
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3 years ago
Which of the following events do biologists consider a random change?
Rufina [12.5K]

Answer:

D. genetic drift

Explanation:

4 0
3 years ago
Read 2 more answers
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
How do scientists collect evidence about climate?
True [87]
<span>by collecting “proxy data” from tree rings, ice cores, and historical records</span>
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3 years ago
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