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photoshop1234 [79]
3 years ago
5

Explain the relationship between the mass of star and its life span.

Biology
2 answers:
Lapatulllka [165]3 years ago
7 0
The larger mass a star has the shorter its life span will be because since it is so large, the more nuclear energy it has to create to keep it up and running. So the smaller the star the longer its life span and vise versa. Hope this helped!
belka [17]3 years ago
7 0

The life of a star basically depended on the hydrogen contained with in it. A star burns hydrogen during majority period of its life and convert hydrogen into helium on the main sequence. So the main sequence life time is determined by the mass of the star as mass of hydrogen contained is equivalent to the mass of star and the life time is dependent on the mass of the hydrogen.

Thus, it can be stated that mass of star is directly proportional to its lifetime.

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A species that is no longer in existence would best be characterized as which of the following?
Gnesinka [82]

Answer:

Extinct.

Explanation:

The IUCN red list classifies the organism as endangered , extinct, threatened and vulnerable organism. The organism are classified on the basis of their number and presence on the particular area.

Extinct species is the species that are no longer present on the earth. The extinct species has been eliminated due to the unfavorable environmental condition and due to human activities. No single organism is present of the extinct species.

Thus, the correct answer is option (3).

3 0
3 years ago
Why would an unprotected traveler's blood boil in the mesosphere?
eduard
An unprotected traveler's blood would boil at normal body temperatures because the pressure is so low. Temperatures in the mesophere decreases with altitude, because there are few gas molecules in the mesophere to absorb the sun's radiation, the heat source is the stratosphere below. The air in the mesophere has extremely low density and as a result the air pressure is very low. 
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2 years ago
How can regulations on fertilizer use help keep freshwater life zones clean from pollution?
Lesechka [4]
Fertilizer is a chemical or has chemicals in it. When the land being fertilized is near water, the fertilizer is washed into the water harming the water and polluting it. Have regulations such as a distance from the water that land must lay, or the amount of fertilizer you can use can help keep the water clean and unpolluted. 
7 0
3 years ago
Read 2 more answers
Plz help with my work I really stuck on this
jek_recluse [69]
Question 1:
Basically, producers are things like plants the are the first source of food. Primary consumers are the first to eat the producers (like small fish, insects, etc) Secondary consumers (foxes, larger fish, etc) consume the primary consumers, and tertiary consumers (sharks, humans, whales, etc.) consume the secondary consumers. Decomposers (fungi, bacteria, etc) like the name suggests decompose rests of food and organisms and send the nutrients back into the earth.

Questions 2&3:
An autotroph is an organism that produces its own food (like plants do through photosynthesis) and a heterotroph is an organism that cannot produce its own food and has to seek out other sources of food.

Question 4:
Grass, Dragonfly, Trout, human

Question 5:
Bean plant, rabbit, fox, bacteria

Questions 6&7:
They are a little harder to explain in text form but hopefully my explanations can help you figure out the answer yourself.

Hope this helped!
3 0
2 years ago
What must happen before a cell can begin mitosis??
ss7ja [257]
Answer - The chromosomes has to be crucially duplicated and it happens actively during the resting phase or interphase.

Reasoning - During the resting phase or interphase you call it, Is important to have the same exact DNA or Chromosomes to be duplicated. If the chromosomes did not duplicate during the interphase then the split of the cell would be unbalance and uneven and likely to cause defects.

7 0
3 years ago
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