B) probably the primitive organism on the left
C) it is certain that the two organisms lived at the same time
D) it is foolish to even speculate about the relative age of the fossils
Answer;
B) probably the primitive organism on the left
Explanation;
The first living organisms we have proof of thanks to fossils, are three and a half billion years old.
Organisms which possess simple body organisation are called primitive organism. They differ from so called advanced organisms as all the activities of life are performed by a single cell.
Primitive organisms do not change their body design so easily as advanced organisms do. Prokaryotes are considered to be primitive forms and eukaryotes are the advanced organisms.
Advanced organisms are complex and have acquired new features morphologically and anatomically by evolution from simpler organisms to better adapt the changing environmental conditions.
C.water
D.climate
I think its B
A. 10 kcal
B. 100 kcal
c. 10,000 kcal
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The approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.
Atmosphere:
It is a mixture of different gases around the earth. This includes Nitrogen, Oxygen, Carbon dioxide etc.
Hence, options A, B, and D are incorrect.
Therefore, the approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.
To know more about Atmosphere,
The pie chart is missing but going with how the atmospheric composition pie chart looks like in general:
A is wrong as some gases such as moisture and carbon dioxide are not elements.
B is wrong as air is not a compound.
D is wrong as air is not a pure substance.
The only answer left is C) The chart shows the percentages of pure substances in a mixture.
Eliminate
B) cause algae and plants to overgrow and pollute the water when they die.
C) accumulate in animals and build up in toxic concentrations as they pass through the food chain.
D) eliminate most of the algae and plants in the food chain, causing animals to starve, at higher levels of the food chain.
C
Pesticides, such as DDT, often have harmful effects on aquatic ecosystems because they accumulate in animals and build up in toxic concentrations as they pass through the food chain. This is referred to as bioaccumulation.
Explanation:
As the DDT is ingested it accumulates in the body tissues because the body of the organisms is unable to break down and excrete the chemicals fast enough or at all. This bioaccumulation also goes up the food chain/web as higher organisms prey on the lower organism on the web. For example, the aphids feed on the leaves sprayed with DDT. They are then preyed on by beetles and flies and bugs. These bugs are then eaten by birds. Eventually, the DDT will be found in the tissues of the birds, even in higher concentrations (due to biomagnification).
Learn More:
For more on bioaccumulation check out;
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Answer:C
Explanation:USATESTPREP