How did cyanobacteria affect Earths atmosphere during the Proterozoic Eon?

Biology

1 answer:

dalvyx [7]3 years ago

7 0

Answer:

These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. In fact, all the plants on Earth incorporate symbiotic cyanobacteria. For some untold eons prior to the evolution of these cyanobacteria, during the Archean eon, more primitive microbes lived the real old-fashioned way: anaerobically. These ancient organisms—and their "extremophile" descendants today—thrived in the absence of oxygen, relying on sulfate for their energy needs. But roughly 2.45 billion years ago, the isotopic ratio of sulfur transformed, indicating that for the first time oxygen was becoming a significant component of Earth's atmosphere,

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Toxoplasma is a protist that must infect cats to be able to reproduce. The infection doesn’t benefit cats and only rarely harms

marin [14]

Answer:

The correct answer is : parasitism.

Explanation:

Parasitism is a symbiosis relationship in which two organism lives together but only one is benefited and other harm in any means. Toxoplasma is, in this case, parasite which is benefited while cats are host and harmed in this relationship.

Degree and chances of harm or benefit do not defines the symbiosis relationship between two organism. Cats are rarely harmed but still harmed in this relationship.

Thus, the correct answer is : parasitism.

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Why is the r group of amino acid important

stepladder [879]

Amino acid reactions. Amino acids via their various chemical functionalities can undergo numerous chemical reactions.

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Saturated fatty acids are different to unsaturated fatty acids because they?

saul85 [17]

Saturated fatty acids are different to unsaturated fatty acids because they have no C=C double bonds.

<h3>What are the differences between saturated and unsaturated fatty acids?</h3>

Saturated fatty acids do not have C=C double bonds, while in unsaturated fatty acids there is at least one C=C double bond in the fatty acid chain.
Saturated fats are usually solid at room temperature and are derived from animal sources, whereas unsaturated fats are usually liquid at room temperature and are from plant sources.
One must reduce the amount of saturated fat in their diet and consume more unsaturated fats like olives, seeds and nuts.
Unsaturated fats can be monounsaturated (contains only C=C double bond) or polyunsaturated (contains two or more C=C double bonds).

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2 years ago

What is the difference between a unicellular organism and a multicellular organism? How does this affect function?

kvv77 [185]

Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialised into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions.

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Uses for genetic engineering include: selet all that applys

jok3333 [9.3K]

Answer:

Uses of genetic engineering include:

increasing plant food production

improving medical treatment

Explanation:

Genetic engineering can be described as a technique in which the genome of an organism is manipulated for the benefit of humankind. The processes of genetic engineering involved the manipulation of the plants and animals DNA so that they will be able to produce more better characteristics. Also, drugs such as vaccines can be produced in animals by the techniques of genetic engineering.

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3 years ago