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Dafna1 [17]
2 years ago
14

A scientist uses a telescope to observe the two stars. Which of these is the best conclusion about the images of the two stars a

s seen by the scientist? A: The images show the stars as they existed 7 years ago. B: The images show the stars as they existed 15 years ago. C: The image of 61 Cygni is more recent than the image of Proxima Centauri. D: The image of Proxima Centauri is more recent than the image of 61 Cygni.
Biology
2 answers:
patriot [66]2 years ago
7 0

Answer:

B) The images show the stars as they existed 15 years ago

Explanation:

Some 15 billion years ago the universe emerged from a hot, dense sea of matter and energy. As the cosmos expanded and cooled, it spawned galaxies

Alik [6]2 years ago
5 0

Answer:

Astronomers use NASA's Spitzer Infrared Telescope and Chandra X-ray Observatory to see young stars, which emit a lot more high-energy radiation than their older versions.

Explanation:

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DerKrebs [107]

Answer:

selective breeding; biotechnology

Explanation:

Selective breeding is a type of artificial selection that consists of crossing plants/animals with desirable and heritable phenotypic traits in order to increase the frequency of such traits in progeny. Selective breeding can be considered as one of the first biotechnological techniques applied by humans. In the past, the selective breeding technique has allowed obtaining domesticated animals (e.g., dogs from wild wolves) and domesticated crops from their wild ancestors (e.g., maize from its wild ancestor teosinte).

7 0
3 years ago
A man heterozygous for blood type A marries a woman heterozygous for blood type B. What could be the possible blood types of the
GenaCL600 [577]

Answer:

Heterozygous A: AO (remember, O type blood is a recessive allele. It's masked by A)

Heterozygous B: BB (h0m0zygous)

AO x BB --> AB, BO

Therefore, the genotypes of their offspring will be 1 AB to 1 BO, while the phenotypes will be 1 AB blood to 1 B blood.

I hope this answer helps you find what your looking for! :)

5 0
3 years ago
Read 2 more answers
Hi, can someone help me with this question? Thank you!
Elenna [48]

Answer:

Can someone help me please Explanation:

Is this test the I going to have trace the path a red blood cell would follow starting in the right ventricle and back to the right ventricle included will be every structure ( heart chamber, valve, vessels ) that the red blood cell would pass trough???

6 0
3 years ago
In what process does adaptation lead to the creation of a new species? a. Mutation c. Speciation b. Adaptation d. Genetics
julsineya [31]

Answer:

This eventual process of speciation by natural selection is illustrated by a sketch ... The integration of genetics with models of natural selection shed tremendous ... processes which cause adaptation within species also tend to create new species. ... Darwin, C. On The Origin of Species by Means of Natural Selection,

Explanation:

7 0
2 years ago
In which blood vessels does the exchange of gases take place?
Vlad1618 [11]

Answer: CAPILLARIES

Explanation: Gas exchange is the delivery of oxygen from the lungs to the blood stream, and the elimination of carbon dioxide from the blood stream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessel is called capillaries, which are located in the walls of the alveoli.

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