How do the atmospheric conditions near the beginning of Precambrian time contrast with the atmospheeic conditions that are present now? Which organism is largely responsible for this change?

Answers

Answer 1

Answer: Early pre-cambrian period the atmosphere consisted only of nitrogen and carbon dioxide without oxygen.

A Prokaryotic cell does not contain a nucleus. It only contains one chromosome and is a single-celled organism. It was the only form of life on earth for millions of years. Examples of a Prokaryotic cell are the different types of bacteria present today.

Autotrophs obtain energy by the process of photosynthesis. Any living organism need energy to survive and autotrophs are no different. Two types of autotrophs are present and they are Photoautotrophs and Chemoautotrophs. The Photoautotrophs rely on the energy produced during the process of photosynthesis and the Chemoautotrophs get their energy from most of the inorganic substances. Phtoautotrophs actually get their energy from the sunlight and then convert it into reusable form. In case of Chemoautotrophs ammonia is an important source of energy for them.

Answer 2

Answer:

Answer:

The atmosphere has a much greater percentage of oxygen now that it did before. Cyanobacteria is the organism that is largely responsible for this change.

Explanation:

Related Questions

Write a summary equation for photosynthesis, showing the reactants and the products of the overall reaction
PLEASE HELP!!!Use mendals law of segregation and independent assortment to describe patterns of inheritance.i would appreciate some help:)
Temperature can weather rocks because _____.most rocks do not absorb heat evenly water contracts when it freezes heat can cause minerals to oxidize rocks usually melt in the hot sun ---- When wet rocks dry out, they can crack and break. This process, called slaking, is an example of what? chemical weathering physical weathering water erosion wind erosion ----- In which of the following locations would chemical weathering happen most quickly? Amazon rainforest Sahara desert North Pole Great Plains ----- Which of the following is an example of chemical weathering? A river carrying dirt into a lake. Wind carrying sand from a beach. Chemicals in water dissolving minerals in rock. Friction between two rock surfaces grinding away minerals. ---- Choose all the answers that apply. Erosion: can damage aquatic ecosystems removes fertile topsoil can decrease revenue from agriculture is caused mainly by wind and water is the breakdown of rock and other material ---- Choose all the answers that apply. Erosion can be reduced by: contour plowing putting up fences planting trees removing topsoil --- Which of the following statements is true? Since the Dust Bowl, erosion has not been a problem in the United States. The most fertile part of soil is found a few feet below the surface. Runoff happens when the ground cannot absorb anymore water. Oxidation happens when carbonic acid gains electrons from oxygen. ---- PLEASE HELP 911
1. Describe how radio telescopes are used to explore space.
What are some of the roles that appendages of the skin play in maintaining body homeostasis?

Which of the following supports the opinion that different species should not be crossbred?Mules are stronger than horses.
Mules are very helpful to humans.
Lions and tigers often mate with one another in the wild.
Offspring from zebra and horse crosses often have health issues.
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Q- 2:

Genetic testing _____.
is only used to treat genetic diseases
is monitored by the Food and Drug Administration
is prohibited by law in 32 states
is required by law in 41 states
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Q3:

There are 3,000,000,000 base pairs in the human genome.
True
False
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Q4-

Which of the following statements is true?
Many states have laws that protect individuals against genetic discrimination.
There are no risks to animal health when organisms from two different species are bred.
Crossbreeding often occurs in nature.
Genetic testing is only used to identify rare genetic disorders.
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Q5-

Which of the following statements is true?
The government is not concerned with genetic ethics.
Scientists can create genetic combinations that do not exist in nature.
There are no laws against genetic discrimination at work.
Personal results from genetic testing must be shared with employers.

Please answer quick i need those answeres, please.

Answers

1) offspring from crossbred animals have health issues.
2) is monitored by the FDA
3) true
4) many states have laws against discrimination
5) scientists can create genetic combos that dont exist in nature

There are different types of cells for every job in your body. How are those cells referred to that develop differently?

Answers

Hi there, you answer to this is They are specialized

Explanation:

A Eukaryotic cell contains a nucleus; more than one chromosome and is typically a multi-celled organism. Animal and plant cell has these. Technically Human cells are similar to Animal cells and plant cells because we are living things.

In our bodies, the cells help our bodies function and serve to protect our body.

Hope this helped :)

Have a great day

Mollusks are snails right

Answers

Right mollusks can be snails, slugs, mussels, and octopuses. They are invertebrate. They have a soft, unsegmented body, and live in aquatic or damp habitats. Most mollusks can have an external calcareous shell.
Hope this helped!

Yes they are related in someway

Based on the information in the graph, what conclusions can be drawn?

Answers

There is no graph that is link.

Which is a possible disadvantage of true breeding?A) The chances of genetic disorders are reduced.
B) Successive generations have shorter life spans.
C) No new genes are added to the future generations.
D) Undesired traits are introduced into future generations.

Answers

C) no new genes are added to the future generation!

C.No new genes are added to the future generations.

In this assignment, you will apply your understanding of Darwin’s theory of evolution by exploring the relationship between natural selection and evolution. You will do this by controlling natural selection in an interactive population. Read the article and use what you learn to complete the following questions. Natural Selection and Evolution Not all members of a species are the same. Every species exhibits . For example, some beetles are green, while others are brown. Not all individuals in a population will survive to reproduce. Those that do, pass their to their offspring.

Answers

Natural Selection and Evolution Not all members of a species are the same. Every species exhibits this is due to variation and not all individuals in a population will survive to reproduce due to different traits.

What are the two evidences that supports the fact that species change due to certain genetic variations?

The two evidences that supports the fact that species change due to certain genetic variations are that mutation and natural selection both cause changes in a population.

Natural selection has been defined as the postulation by Charles Darwin that organisms that are more adapted to their environment live longer and reproduce hence pass on their favorable traits to their offspring.

The two evidences that supports the fact that species change due to certain genetic variations are that mutation and natural selection both cause changes in a population.

Therefore, Natural Selection and Evolution Not all members of a species are the same. Every species exhibits this is due to variation and not all individuals in a population will survive to reproduce due to different traits.

Learn more about natural selection on:

brainly.com/question/1657375

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Answer: VARIATION & TRAITS;GENES

Explanation:

I JUST DID IT;)

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