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kow [346]
3 years ago
8

When did Cyanobacteria start producing pure oxygen

Biology
2 answers:
AleksandrR [38]3 years ago
8 0

Answer:

After the hadeon

Explanation:

Travka [436]3 years ago
3 0

<u>Answer:</u>

Cyanobacteria start producing pure oxygen around 200 million years ago.

<u>Explanation:</u>

Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis.  This was around 4.5 billion years ago: after Hadean eon.

They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.

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Around the year 1800, it was discovered that fossils are arranged in comparable patterns within the layers of the Earth. Name 3
frez [133]

Answer:

Study of comparative anatomy emerged in the 18th century and led to establishment of relationship between species based on the common traits

Explanation:

The three major events that occurred after this discovery are –  

a) Discovery of the fact that the age of earth is much higher than the age of earth as found in previous theories of continental drift theory

b) The age of the oldest fossils was determined and based on that relative age of all species (as found in fossils) was determined.  

c) The determination of age of fossil helped to find the gaps in the evolutionary tree and hence provoked search of these missing species.

The study of comparative anatomy started somewhere around 1800 when George Cuvier emerged as father of comparative anatomy

Based on comparative anatomy study, scientists such as Buffon and Lamarck worked on establishing relationship between species based on the common traits shared between them

5 0
3 years ago
Do you think your model accurately demonstrates the water cycle
Mrrafil [7]
The answer to the water cycle<span> or hydro logic is a continuous </span>cycle <span>where </span>water<span> evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. ... As clouds move up and over mountains, the </span>water<span> vapor condenses to form precipitation and freezes. states the inter-web.</span>
8 0
2 years ago
Drag each label to the correct location on the table. Classify the planets as terrestrial planets or gas giants
juin [17]
The four terrestrial planets are known as Mercury, Venus, Earth and Mars, they are all rocky planets composed primarily of silicate rocks and/or metals. They are all the planets closest to the sun in our Solar System. The Gas Giant's or Jovian Planets and <span>are composed mainly of a combination of gases/elements: </span>hydrogen<span>, </span>helium<span>, and </span>water<span> that exist in various </span><span>physical states. These are Jupiter, Saturn, Uranus and Neptune. Behind them is the dwarf planet Pluto (which has recently been re-instated officially as a planet), this is located in the Kuiper Belt.</span>
7 0
3 years ago
Reagan is a young girl with a genetic developmental disorder. Her language development has been severely affected by this condit
gtnhenbr [62]

Answer:

Option D

Explanation:

Complete question

Reagan is a young girl with a genetic developmental disorder. Her language development has been severely affected by this condition, and as such she has been diagnosed with a specific language impairment. Which condition is NOT likely to have contributed to this delay?

A) autism spectrum disorder

B) Down syndrome

C) fragile-X syndrome

D) PKU

Solution

Phenylketonuria (PKU) is a kind of genetic disorder in which body starts producing and building up phenylalanine amino acid. PKU arises when the Phenylalanine hydroxylase enzyme is not synthesized due to a genetic defect thereby affecting creation of neurotransmitters such as epinephrine, norepinephrine, and dopamine. Some of the symptoms of this disorder are hyperactivity, seizures, eczema, tremors etc. PKU is not connected with language development issues and hence correct option is D

4 0
3 years ago
Groups of similar cells that work together
NNADVOKAT [17]

A group of cells that performs a similar function is known as  tissue.

8 0
3 years ago
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