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masha68 [24]
3 years ago
11

What caused the tree trunks to turn from light to dark in color?

Biology
1 answer:
Harrizon [31]3 years ago
3 0
It was pollution from the industrial revolution that caused tree trunks to turn from light to dark in color.
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How are the carbon, nitrogen, and oxygen cycles similar? a. they are all biogeochemical cycles. b. they all involve an interacti
professor190 [17]
D because carbon, nitrogen, and oxygen are apart of like everything
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Earth has 3 main planet zones because the differences in latitude and
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The distribution of sunlight
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3 years ago
The carbon phosphorus and nitrogen cycles are collectively referred to as __________ cycles
NeTakaya

Answer is Biogeochemical cycles.

In an ecosystem biotic (living) abiotic (non-living) components constantly interact each other. During these interactions, there is a transfer of nutrients between living organisms and the non-living environment. Thus, there is recycling of inorganic matter between living organisms and their non-living environment. This cycling of matter is called biogeochemical cycles.

 

6 0
3 years ago
Under which circumstances should we try to control the population numbers of Pfiesteria?
zvonat [6]

Answer:

Pfiesteria species generally found in estuaries, the population of which are needed to be controlled only when they becomes toxic. Presence of large of fish triggers toxicity in Pfiesteria.

Explanation:

Pfiesteria are known to be associated with fish kills as for example large fish kill in the seas of North Carolina. It also causes blooming of algae in enormous numbers thus make the water bodies, hostile for survival of fishes and other marine lives. It affects human too by release of toxins in air and water often resulting in respiratory problems, infections of gastrointestinal system, headaches and fatigue. In this type of grave circumstances, leading to outburst of population of Pfiesteria, there is an urgent need to control.

8 0
3 years ago
How can a robin have a ddt concentration of 444 ppm even though the soil contains only 10 ppm of ddt
zaharov [31]

Robin can have a ddt concentration of 444ppm while the ddt concentration of soil is 10 ppm. This happens due to biological magnification.

<u>Explanation:</u>

In biological magnification the concentration of toxic substances at successive trophic levels keeps increasing. Due to biomagnification, what starts out as a small concentration grows  while moving to successive trophic levels. DDT is a pesticide which is used to kill pests that affect crops.

DDT used in farms gets deposited in the soil. From the soil it can reach various trophic levels. At each trophic level its concentration keeps increasing.

Robin is a bird that is a secondary consumer and thus belongs to the higher trophic level. Thus even if the DDT concentration is as low as 10ppm in the soil its concentration will keep increasing and can become a high value like 444ppm.

3 0
2 years ago
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