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melisa1 [442]
3 years ago
13

Which of these would be evidence that cyanobacteria evolved the ability to perform photosynthesis and released oxygen as a bypro

duct over 2 billion years ago? A) The presence of iron oxides (rust) in sedimentary rock layers that are 2 billion years old B) The presence of an iridium-rich layer in sedimentary rock dating from times of mass extinctions C) The presence of chloroplasts in fossilized eukaryotes from fossils dating from 2 billion years ago forward D) The formation of stromatolite rock structures from aggregates of cyanobacteria dating 3.5 billion years ago
Biology
2 answers:
natali 33 [55]3 years ago
7 0

Answer:

A) The presence of iron oxides (rust) in sedimentary rock layers that are 2 billion years old

Explanation:

Cyanobacteria learned aerobic photosynthesis. As a result, they absorbed CO2 and solar energy to break down water molecules, releasing oxygen into the atmosphere. This was how oxygen came to planet earth and allowed the life we know.

The strong oxidizing power of oxygen has transformed iron into iron oxide that is deposited on the seabed in layers. Once saturated minerals, oxygen begins to accumulate in the atmosphere.

Thus, we can say that the evidence of the participation of cyanobacteria in the release of oxygen in our atmosphere is the presence of iron oxides (rust) in 2 billion year old sedimentary rock layers.

Lady bird [3.3K]3 years ago
3 0

Answer:

its b

Explanation:

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The correct answer is - 25%

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A cross between true tall pea plant and heterozygous tall pea plant is the cross of tall allele whic is TT and heterozygous which is Tt, so the gametes will be formed would be - T and T by true tall plant and T, and t allele by heterozygous plant.

The Punnett square of this cross is attached with the answer, where 2 heterozygous offspring and two tall offspring produced. In which there is only two recessive short allele formed in this generation out of 8 alleles.

So the probability of short allele would be:

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