BIOLOGY HIGH SCHOOL

Early organisms in the precambrian era converted ______ to oxygen.

Answers

Answer 1
Answer:

Answer:

Early organisms in the precambrian era converted ___Carbon dioxide__ to oxygen.

Explanation:

THE PRECAMBRIAN ERA:

The word Precambrian means before the Cambrian period. Before the formation of oldest rock with having fossils in them this term was used to the whole period of earth's history.

This era gone through number of important changes. One important change is that atmosphere of this era is deprived of Oxygen. All other content of the atmosphere is same as component of air present today but with little water vapours. Early organisms in the precambrian era converts carbon dioxide into oxygen. This oxygen was very less and begins to combine chemically with iron and other elements. This produces great mineral deposits around the world. This is the era from where aerobic respiration organisms start their life cycles.
Answer 2
Answer: Carbon dioxide to oxygen.
This was the start of the evolution of photosynthesis, where carbon dioxide is broken down to its constituents, and the carbon is used for the synthesis of glucose to be stored in the organism as energy storage.

Hope this helps! :)

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Which characteristics do cell membranes and cell walls have in common?

Answers

Both protexts the organisms' organelles which are inside the cell.
Animal Cell: Cell Membrane
Plant Cell: Cell Wall
Cellwall is present only in plants, it is not found in all organisms.Compared to the cell membrane, a cell wall is thick and has a rigidstructure. You can see it in a light microscope, because it is visible.It serves as the protective cover that surrounds the plasma membrane in aplant cell. Cell membrane is composed of lipids. Cell walls can be madeup of cellulose or peptidoglycan or chitin.

Polymers are formed by joining several units called monomers.what does the term monomer refer to?the answers are
a unit made up of several compounds
a unit made of several atoms
a unit made of several molecules

Answers

A monomer is a molecule, which means that it is a group of two or more atoms, which are bound in a chemical bounds. So the correct answer is a unit made of several atoms. 

The term monomer refers to:

a unit made up of several atoms

Explanation:

A monomer is a molecule that "can support polymerization whereby providing constitutional units to the fundamental structure of a macromolecule". Large quantities of monomers combine to form polymers in a method called polymerization.

Acid rain occurs when sulfur dioxide in the atmosphere is oxidized in the presence of nitrogen dioxide. Acid rain is an example of _______.a.
a primary pollutant
b.
a secondary pollutant
c.
a tertiary pollutant
d.
none of the above

Answers

The correct option is b. a secondary pollutant.

A primary pollutant is any pollutant emitted directly from the source while secondary pollutants form when the hydrocarbons, and oxides of nitrogen and sulfur combine with sunlight combines with oxygen or water vapor present in atmosphere.

The acid rain is formed when the sulfur dioxide reacts with water to form acids which combines with rain and rain becomes acidic in nature.
The right answer for the question that is being asked and shown above is that: "a secondary pollutant" Acid rain occurs when sulfur dioxide in the atmosphere is oxidized in the presence of nitrogen dioxide. Acid rain is an example of a secondary pollutant.

Which of the following solutions has the greatest concentration of hydrogen ions in it?a pH 3 solution
a pH 7 solution
a pH 2 solution
a pH 12 solution

Answers

it is a pH 2 solution

Why is a frogs tounge anchored in the very front

Answers

 When a frog catches an insect, it throws its sticky tongue out of it’s mouth and wraps it around its prey.  The frog’s tongue then snaps back and throws the food down its throat.

Identify the biomes on the map and then answer the questions that follow
(please help asap!)

Answers

Answer:

1- Temperate rainforest biome

2- Coniferous (boreal) forest biome

3- Desert biome

4- Tundra biome

5- Temperate deciduous forest biome

6- Tropical rainforest biome

Explanation:

The tropical rainforest biome is located near the equatorial region where the amount of sunlight is maximum. As a result of which this area experiences maximum rainfall, that helps in the increasing amount of plants and animal species. This provides all the essential nutrients required by the organisms. Here, in this region, the temperature throughout the year remains high and receives the highest amount of rainfall.

The tundra biome is located in and around the polar region. The temperature in this region remains very cold, supporting a good number of plant and animal species.  

The desert biome is located along the 30° latitude in both the hemisphere. The temperature remains relatively very high throughout the year due to the lack of rainfall. The region is very dry. There is significantly less amount of plants in this region.

These are the pictures that match the answers 1st.= 1st pic 2nd= 2nd pic and so on and so on.
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