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AlexFokin [52]
3 years ago
12

NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of

life. Which of the following is good evidence for the presence of bacterial cells?
a. The cell size of 0.5 to 2 microns
b. Three-dimensional organization of cells in a starburst pattern
c. Absence of carbon in the material
d. No evidence of water in the surrounding mineral
Biology
1 answer:
il63 [147K]3 years ago
4 0

Answer:

The correct answer is - option A.

Explanation:

Among all of the given options the best character of the bacterial cell is the size of the cell which ranges in between 0.5 to 2 microns. The best evidence for the presence of bacterial cell is the smaller size of the cells.

Rest of the characters provided in the options does not matches with the characteristics of bacterial cells and not related to the bacteria.

Thus, the correct answer is option A.

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Burning of fossil fuels that release sulphur and nitrogen compounds into the air is identified as the major cause of acid rain in the united states.

<h3>What are the causes of acid rain?</h3>
  • Acid Rain is created when sulphate and nitrogen oxides from the atmosphere react with rainwater and fall as a result.
  • Sulphur and nitrogen particles that mix with the wet elements of rain are the main causes in the production of acid rain.
  • Due to air pollutants, notably the excessive levels of sulphur and nitrogen released by machinery and industrial operations, acid rain is made up of water droplets that are extremely acidic.
  • The emissions that are released from industries are man-made causes.
  • The natural causes, such as lightning strikes in the atmosphere that release nitrogen oxides and volcanic eruptions that release sulphur oxide.

The complete question is :

What have the scientific studies identified as the major cause of acid rain in the United States?

a )chemicals still in the atmosphere from the asteroid collision with the earth

b) excess solar radiation due to the depletion of the ozone layer

c) volcanic ash in the air

d) burning of fossil fuels that release sulphur and nitrogen compounds into the air

To learn more about acid rain , refer:

brainly.com/question/6700006

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