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GaryK [48]
3 years ago
9

Based on the information in the podcast, ocean planets are prime targets in the search for life. However, scientists are also se

arching Mars for life, even though Mars is not an ocean planet. Why is Mars still considered to be a good candidate in the search for extra terrestrial life? A) Fossil cyanobacteria have been found in rock samples from Mars.B) Martian soil releases carbon dioxide under conditions that could support life.C) Some photos suggest that there are underground stores of water on Mars.D) There are signs that Mars once had liquid water on its surface.
Biology
1 answer:
grin007 [14]3 years ago
4 0

Answer:

The correct answer is D) There are signs that Mars once had liquid water on its surface.

Explanation:

Researchers have not found life, or evidence of life, on Mars yet. This planet is considered to be a good candidate in the search of extraterrestrial life because, even though it is smaller than the earth, it still is a huge planet with high possibilities of life on it.  

There is evidence that more than 3.500 million years ago, Mars was a warmer planet with water on its surface. There are, for example, some dry riverbeds that reflect the presence of rivers on the planet´s surface.  They believe that Mars once had an atmosphere with CO², but after losing it, the planet became cold and desertic.

Researchers have found subterranean water, which was detected by radar. There is a lake in the martian south pole, 1.5 km under a thick ice layer, that has at least a meter wide, 20 kilometers long, and is surrounded by high ground. They establish that its origin is the melting of the ice. It is very cold and salty, which makes it difficult to find life on it, but the only ecological niche that could exist for life is underground where there is protection from extreme cold and high radiation levels.

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Select the correct answer. During which stage of fetal development do the heart and lungs of a fetus become fully developed and
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7 0
3 years ago
Please i need help with this....
steposvetlana [31]

Answer:

Punnett squares

W is dominant

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       W            w

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Explanation:

Punnett squares

W is dominant

w is recessive

       W            w

W    WW        Ww

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3 0
3 years ago
If a DNA molecule is found to be composed of 40% thymine, what percentage of guanine would be expected.
Likurg_2 [28]

Answer:

10%

Explanation:

Chargaff postulated the complementary base pairing rule, where he stated that in the DNA molecule, Adenine (A) will always pair with Thymine (T) and Guanine (G) with Cytosine (C) i.e. A-T, G-C

Chargaff stated that the concentration of purines (Adenine and Guanine) is always equal to that of pyrimidines (Thymine and Cytosine) i.e. {A} + {G} = {C} + {T}

These equal concentration equals 100% in totality i.e. A+G+C+T= 100%

Thymine pairs with Adenine, if there is 40% of Thymine in the DNA molecule, it means there will be 40% of Adenine also. 40 + 40 = 80%. This leaves us with 100-80 = 20% for Guanine and Cytosine.

Since there will be an equal amount of Guanine and Cytosine too, Guanine will therefore, be 20/2 = 10%.

That is, 10% Guanine, 10% Cytosine.

8 0
3 years ago
Which is true of the light reaction of photosynthesis?
krek1111 [17]

Answer:

Answer: The correct option is C) It produces ATP.

Photosynthesis is the process by which green plants prepare their own food using CO₂ and H₂O in the presence of sunlight. It is primarily divided into light reaction and dark reaction.

The light reaction takes place in the thylakoid membranes of the chloroplast. In this reaction, energy from sunlight is captured by the chlorophyll pigment via a series of chemical reactions. This results in the formation of two high energy chemical compounds, which are ATP and NADPH.

These compounds are further used in the dark reaction for the synthesis of food ( which is glucose).

Thus, it produces ATP is true for the light reaction of photosynthesis.

3 0
3 years ago
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