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netineya [11]
3 years ago
8

16 POINTS

Biology
2 answers:
katen-ka-za [31]3 years ago
8 0

Answer: The correct answer is-

C.They replaced carbon dioxide with oxygen in the atmosphere.

Cyanobacteria ( also known as blue green algae) is a large phylum of bacteria that is capable of synthesizing its own food using carbon dioxide and water in the presence of sunlight ( photosynthesis).

They contain a green pigment called chlorophyll that absorbs energy from sunlight and helps in the formation of food ( glucose). They release oxygen as a byproduct in the atmosphere.

As these organisms utilize carbon dioxide ( that is present in the atmosphere) to give oxygen in return, therefore, they affected early atmosphere of Earth by replacing carbon dioxide with oxygen.

Thus, option C) is the right answer.

STatiana [176]3 years ago
5 0

The correct answer is option C, They replaced carbon dioxide with oxygen in the atmosphere.

Reason -

Cyanobacteria are aquatic organisms that are capable to phosynthesise and produce their own food.  They are unicellular bacteria found , some 3.5 billion years ago. They produced the oxygen during the Archaean and Proterozoic Eras however before that the atmosphere has an unstable chemical composition which do not support life. They also led to the origin of plants which further added to the production of oxygen in the atmosphere.  

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 Answer:

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  • The inheritance of the<u> dominant trait</u> is demonstrated by <u>Pedigree 3 </u>because affected children still have affected parents (remember that all four diseases are rare). The trait must be <u>autosomal dominant</u> because it is passed down to the son by the affected father. There is a 1/2 risk that the heterozygous mother (II-5) would pass on mutant alleles to a child of either sex for an autosomal dominant feature.
  • <u>Pedigree 4</u> is an <u>X-linked dominant function</u> characterized by the transmission to all of his daughters from the affected father but none of his son. On the mutant X chromosome, the father (I-1) passes on to all his daughters and none of his sons. As seen by his normal phenotype, II-6 therefore does not bear the mutation. An affected child's likelihood is 0.    

In the question the pedigree chart was missing ,hence it is given below.

     

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