Which of the following is evidence for how the composition of the atmosphere has changed on Earth over time? a. Bands of iron found in rock layers show that the Earth's atmosphere became oxygenated by photosynthetic cyanobacteria millions of years ago.
b. Frequent volcanic eruptions have caused the Earth's atmosphere to fill with sulfur aerosols dropping the temperature globally by 5 degrees.
c. Multiple ice ages in the 18th century have caused a shift in atmospheric circulation on present day Earth.
d. Over the past 50 years, greenhouse gas concentrations have rapidly decreased in the atmosphere.

Answers

Answer 1

Answer: Hello there.

Which of the following is evidence for how the composition of the atmosphere has changed on Earth over time?

Multiple ice ages in the 18th century have caused a shift in atmospheric circulation on present day Earth.

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Make an argument. What organs need to be irrevocably and permanently damaged for a person to be declared dead? Justify your answer.

Answers

Answer:

your brain

Explanation:

why this is well because no brain your dead it helps you eat sleep breath and pump your heart no brain no HEART ether but thats me

What does selectively permeable mean

Answers

Selectively permeable means that it allows only the nutrients it needs but keeps out the bad things out. For example, some windows have the netting to keep out the bugs from going into your house. That is selectively permeable.

Final answer:

Selectively permeable refers to the property of cell membranes that allow certain substances to pass through but bar the passage of others. This characteristic is crucial for cell survival as it enables necessary nutrients to enter, harmful substances to flee, and blocks the entry of any negative materials.

Explanation:

The term selectively permeable refers to a property of cell membranes. If a cell membrane is selectively permeable, it means the membrane allows certain substances to pass through while restricting the passage of others. This function is vital for cell survival, as it allows essential nutrients to enter, unwanted substances to leave, and also prevents harmful materials from entering the cell.

For instance, a cell membrane is typically permeable to small molecules like oxygen and carbon dioxide but impermeable to larger molecules such as amino acids and sugars, unless facilitated by specific transporters.

Learn more about Selective Permeability here:

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Cells can contain thousands of different genes; however there is often only a small percentage of these genes that are being expressed at any given time. this indicates that - a. cells are unable to express all genesb. gene expression is regulatedc: the expression of genes is randomd unused genes are removed from the dna

Answers

Answer:

b. gene expression is regulated

Explanation:

Several mechanisms exist in the cell which regulate the turning on or turning off of certain genes.

These mechanisms are collectively referred to as gene regulation. The regulation can occur in several ways, including;

Structural and chemical changes to genetic materials in the cell.
Regulation of transcription process.
Regulation of mRNA translation or protein synthesis

The correct option is b.

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Which is true about the elongation of the leading strand during DNA synthesis?A.It depends on the DNA polymerase action.

B.It produces RNA fragments.

C.It does not require a template strand.

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I most likely think its A

These polar bears can be found all around the North Pole. The natural environment where any species lives is called its

Answers

The natural environment where any specie lives is called its HABITAT.
An habitat refers to the ecological or environmental area where a particular animal specie or plant specie can be found. Living organisms usually get all they need to survive from their habitats. There are different types of habitat and living organisms have capacities to adapt to their habitats.

the answer is habitat

What is the condition of the atmosphere at a particular time and place?

Answers

The condition of the atmosphere at a particular time and place is 'weather'. The answer to the question posted above is 'weather'. Weather is the state of the atmosphere at a given time and place with variables such as wind, temperature and more that affect it.

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