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musickatia [10]
3 years ago
13

How do the atmospheric conditions near the beginning of Precambrian time contrast with the atmospheeic conditions that are prese

nt now? Which organism is largely responsible for this change?
Biology
2 answers:
Art [367]3 years ago
7 0
Early pre-cambrian period the atmosphere consisted only of nitrogen and carbon dioxide without oxygen.

<span>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.

</span><span>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.</span>


Darya [45]3 years ago
5 0

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:

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Answer:

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4 0
2 years ago
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The lipopolysaccharide (LPS) possessed by Gram-negative bacteria contributes to the virulence and pathogenic potential of these
Alexeev081 [22]

Answer:

A. Lipid A

Explanation:

The outer membrane of Gram-negative bacteria is present outside to the thin peptidoglycan layer. The outer membrane consists of lipopolysaccharide (LPS) which is the molecule having both carbohydrates and lipids.

The lipopolysaccharide has three parts out of which lipid A is the toxin one. Lipid A is embedded in the outer membrane through its fatty acids. When lipid A enters the blood stream of the host cell, it leads to septic shock. Lipid A is heat stable and highly toxic.

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3 years ago
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8 0
3 years ago
two parent butterflies with normal wings have offspring with altered wing shapes what most likely caused this change
Allisa [31]

Answer:

The Parents may have had heterozygous genotypes.

Explanation:

Normal wings could be the dominant allele that is expressed in the phenotype, and altered wings could be the recessive allele. If both parents had a heterozygous genotype, it is possible for the offspring to have a homzygous recessive genotype.

3 0
2 years ago
Geologist learn about Earth’s interior by studying ______, which move through Earth.
Lynna [10]

The right answer is A. sismic waves.

Seismic waves correspond to elastic waves that propagate on the surface and inside our planet following an earthquake.

They appear when a starting impulse sets particles in motion, which in turn will move the material to their contact before returning to their original place. The generated phenomenon can then spread over tens, hundreds, even thousands of kilometers. Note that these waves can be generated artificially in seismic studies.

Like all waves, they can be reflected or refracted when they pass from one medium to another (for example between the mantle and the Earth's core).

7 0
3 years ago
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