Before there was any life on earth, which gas was absent from earth’s ancient atmosphere?

Answers

Answer 1

Answer: Oxygen was absent from the atmosphere it has only been present for the past 2.7-2.8 billion years but the earth is approximately 4.5 billion years old.

Answer 2

Answer:

Oxygen is your answer.

thanks and hope help

Related Questions

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At one time, dinosaurs lived on Earth. Today they are extinct. This relates to _____.A. microevolution
B. both macroevolution and microevolution
C. macroevolution

Answers

The answer is letter C. macroevolution. Macroevolution refers to an evolution of the largest scale, specifically creation of new species and extinction while Microevolution refers to a change in gene frequency within a population; molecular basis for evolution. The process of speciation may fall within the purview of either, depending on the forces thought to drive it.

Answer:

macroevolution

Explanation:

What is the production of new plants without seeds?

Answers

this is called vegetative or asexual reproduction

Which statement describes the reaction for cellular respiration?a)The equation is carbon dioxide + water → glucose + oxygen + water and energy is required in the form of light

b)The equation is glucose + oxygen → carbon dioxide + water and energy is produced in the form of ATP.

c)The equation is carbon dioxide + water → glucose + oxygen + water and energy is produced in the form of ATP.

d)The equation is glucose + oxygen → carbon dioxide + water and energy is required in the form of light.

Answers

Answer:

The answer to your question is: B

Explanation:

a)The equation is carbon dioxide + water → glucose + oxygen + water and energy is required in the form of light. This option is totally wrong, the reactants in cellular respiration are sugar and oxygen, and cellular respiration never forms light.

b)The equation is glucose + oxygen → carbon dioxide + water and energy is produced in the form of ATP. This option is correct, in cellular respiration the cell uses sugar and oxygen to make carbon dioxide, water and ATP.

c)The equation is carbon dioxide + water → glucose + oxygen + water and energy is produced in the form of ATP. This option is wrong, it's describing an unknow process to me.

d)The equation is glucose + oxygen → carbon dioxide + water and energy is required in the form of light. This option is partially correct, but the last part makes it wrong because cellular respiration doesn't use light to obtain energy.

Answer:

b)The equation is glucose + oxygen → carbon dioxide + water and energy is produced in the form of ATP.

The number 0.00243 has how many significant digits?
a. 3
b. 4
c. 5
d. 6

Answers

The number 0.00243 has 3 significant digits.

The correct answer is option B. 0.00243 has three significant digits. This is because for a decimal number which is less than 1, all the digits except the leading zero after the decimal point are considered to be insignificant. Thus, the two zeroes after the decimal point are insignificant.Therefore, the remaining three digits i.e. 243 are the significant digits.

What are the macromolecules DNA and RNA referred to as? Proteins Carbohydrates Nucleic acids

Answers

DNA and RNA macromolecules are referred to as Nucleic Acids.

Tips bark at people BARK BARK BARK

Answers

Answer:

You talking about a dog or something

Explanation:

BARK BARK BARK BARK BARK BARK

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