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NNADVOKAT [17]
2 years ago
13

HELP PLEASE Current theory is that all life on earth originated from

Biology
2 answers:
mezya [45]2 years ago
6 0

Answer:

single cell prokaryotes

skelet666 [1.2K]2 years ago
6 0

Answer:

Single-cell prokaryotes

Explanation:

The first cells were most likely very simple prokaryotic forms. Ra- diometric dating indicates that the earth is 4 to 5 billion years old and that prokaryotes may have arisen more than 3.5 billion years ago

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How can the Earth be a closed system if space shuttles can leave the
gtnhenbr [62]

Answer:

The answer is- A). Because it takes tremendous effort to break free from the laws of gravity to exit the Earth's atmosphere.

Explanation:

I really don't have an explanation. Except that I love science and I actually pay attention in my classes.

6 0
3 years ago
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In humans, blue eyes are caused by a recessive allele ("b") that dilutes pigment production. BB and Bb individuals have brown ey
saveliy_v [14]

Answer:

Probability that the son will be:

color-blind = 1/2

blue eyed = 1/8

blue eyed and color-blind = 1/16

Explanation:

Mother : BbXcX

Father : BbXY

Colorblindness is X linked recessive trait hence will be caused when the son has XcY genotype.

XcX   X    XY :

     Xc    X

X  XcX  XX

Y   XcY  XY

Half of the sons will have normal vision and other half will be colorblind hence, there is 1/2 probability that the son will be colorblind.

Eye color is autosomal trait and blue color will be produced when the child has bb genotype.

Bb     X    Bb  :

   B    b

B  BB  Bb

b  Bb   bb

1/4 of the children will have blue eyes. Since half of the children are expected to be males, 1/4 * 1/2 = 1/8 sons are expected to have blue eyes.

Probability of a son being blue eyed and color blind will be :

1/8 * 1/2 = 1/16

3 0
2 years ago
Light pollution harms plants and animals because they confuse it with_____
valentinak56 [21]

Answer:

The moon

Explanation:

Most nocturnal plants, animals and insects, like moths, use the moon as their guide through the night. This is why insects are attracted to light in the nights

7 0
2 years ago
What is an organelle
Setler [38]

Good afternoon. An organelle is any structure in cells that has a specialized function. They are usually found in eukaryotic (nucleus) cells. They help with energy, making proteins, and removing wastes from a certain area. They are composed of large molecules such as proteins, carbohydrates, lipids, and nucleic acids. I hope I helped!! If you have any more questions then don't hesitate to let me know. Have a great day!!

4 0
3 years ago
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Imagine that you've discovered a regulatory sequence thousands of base pairs away from the promoter and that when this sequence
Tresset [83]

Answer:

An Enhancer

Explanation:

Enhancers are the regulatory sequences and are generally located 80-160 base pairs upstream of the transcription start site. Enhancers have bidirectional elements that are involved in the initiation of transcription. Enhancers serve as the binding sites for activators to increase the concentration of activators in the vicinity of the promoter and thereby increase the rate of transcription of the gene.

According to the given information, the loss of a regulatory sequence led to a reduced level of transcription of the gene. This means that the regulatory sequence was involved in the upregulation of transcription. The presence of the sequence far away from the promoter makes it an enhancer.

4 0
3 years ago
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