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Alla [95]
4 years ago
8

How do we know what happened on Earth before humans were around?

Biology
2 answers:
vredina [299]4 years ago
7 0
God told a human that told us all
Lubov Fominskaja [6]4 years ago
3 0
I guess it depends on what you personally believe happened. No one knows for sure as of today. 
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Floods, droughts, fires, and earthquakes are examples of _____.
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It is natural disasters
4 0
3 years ago
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The ability of the human body to break down the red color in beets is controlled by an autosomal dominant allele. The inability
Zinaida [17]

Answer:

Explanation:

<em>Let the ability to break down the red color in beets be represented by the allele </em><em>B</em><em>. The inability would be represented by the allele </em><em>b</em><em>.</em>

A nonsecretor's genotype would be BB or Bb while a secretor's genotype would be bb.

A nonsecretor woman with a secretor father would be a carrier with genotype Bb. A nonsecretor man who in a previous marriage had a secretor daughter would also be a carrier with genotype Bb. If the two marries:

            <em>Bb     x     Bb</em>

<em>            BB    2Bb    bb</em>

1.

(a) probability of their first child will be a secretor girl = probability of having a girl and being a secretor.

Probability of having a girl = 1/2

Probability of being a secretor = 1/4

<em>probability of their first child will be a secretor girl</em> = 1/2 x 1/4 = 1/8

(b) Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor.

Probability of having a girl = 1/2

Probability of being a nonsecretor = 3/4

<em>Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor</em> = 1/2 x 3/4 = 3/8

2. <em>Probability that their first two children will be nonsecretors of either sex = probability of their first being a nonsecretor and of either sex and probability of their second being a nonsecretor and of either sex.</em>

  = 3/4 x 3/4 = 9/16

6 0
4 years ago
During photosynthesis green plants produce
Elanso [62]

Answer: carbon dioxide

Explanation:

7 0
3 years ago
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A wave of infrared light has a speed of 6 m/s and a wavelength of 12 m. What is the frequency of this wave?
Bad White [126]

Answer:

Explanation:

The frequency of the wave is 0.5 hertz.

La frecuencia de la onda es de 0,5 hercios.

4 0
3 years ago
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In order to prevent pest infestations it is important to.
svlad2 [7]

Answer: Take out the trash regularly, make sure food is stored in secure containers, clean the house regularly, and don't leave perishable foods out for a long time.

8 0
2 years ago
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