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almond37 [142]
3 years ago
14

What is the composition of earths atmosphere

Biology
1 answer:
gogolik [260]3 years ago
7 0

The earth's atmosphere consists mainly of nitrogen and oxygen with smaller proportions of other gases such as carbon dioxide. The amount of carbon dioxide in the atmosphere is maintained through a balance between processes such as photosynthesis, respiration and combustion. However this balance is being affected by human activities which are polluting the atmosphere.

The proportion of these gases in the atmosphere is as follows: nitrogen is the most abundant at 78%, oxygen is next at 21%,  while others  include carbon dioxide at 0.037% and argon at 0.9 % .

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Why would it be expected that a swordfish would exhibit higher methyl mercury levels than a tilapia? (site 2)
kirill [66]

Answer:

Answer is explained below;

Explanation:

Mercury is a liquid metal that is released into the environment by both natural processes such as volcanic activity, weathering of rocks, etc and human activities such as waste materials from factories. The mercury that reaches the ocean and other water sources is converted into methylmercury by bacteria. Methylmercury is a neurotoxin that interferes with the nervous system and is easily absorbed by the human body.

The methylmercury is taken up by planktons. Small fishes consume large quantities of plankton. Tilapia is a small, short-lived freshwater fish. The methylmercury level in tilapia is lower than that of other fish. When large, long-living predatory fishes such as tuna, shark, king mackerel, swordfish, etc consume many smaller fish with low mercury levels, this causes accumulation of methylmercury at extremely high levels in their tissues over time i.e., the amount of mercury in such bigger fish biomagnifies.  

So large, long-lived predators like swordfish and shark often have the highest methyl mercury levels than a small, short-lived tilapia.

3 0
2 years ago
Read 2 more answers
Order these steps of the lytic cycle. A. Assembly B. Penetration C. Lysis D. Synthesis E. Adsorption
saul85 [17]

Answer:

The correct order is

E. Adsorption

B. Penetration

D. Synthesis

A. Assembly

C. Lysis

Explanation:

Virus can have two reproduction cycle that is lytic and lysogenic. In the lytic cycle first step is virus adsorption or attachment on the host cell surface. The second step is penetration in which the virus penetrated the host cell and injects its genetic material in the host cell.

The third step is synthesis, in this stage, the viral genome gets incorporated and produces viral proteins required for capsid formation. The fourth step is assembly in which viral protein assembled around viral nucleic and form new viruses.  

The final step is lysis where the new viruses lyse the host cell to come out of the host cell and infect other cells.

3 0
3 years ago
Select the correct answer from each drop-down menu.
vagabundo [1.1K]

Answer:

through mitosis and DNA replication im pretty sure

Explanation:

8 0
3 years ago
5
zubka84 [21]

Answer:

C.

It controls the entry and exit of substances.

8 0
2 years ago
The energy role of the first organism in a food chain is always a(n)______.
Naddik [55]
The first organism in the food chain is the producer.
8 0
3 years ago
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