« previous next »

Author Question: The habitable zone is the area around a star where: A) planets with life have been found. B) ... (Read 63 times)

luvbio

  • Hero Member
  • *****
  • Posts: 623
on: Jul 27, 2018
The habitable zone is the area around a star where:
 
  A) planets with life have been found.
  B) human beings could live.
  C) the Greenhouse Effect is possible.
  D) a planet could have an atmosphere.
  E) temperatures are suitable for planets to have liquid water.

Question 2

Why does detection of abundant free oxygen in an atmosphere suggest life is present? Does its absence prove life could not be present?
 
  What will be an ideal response?


lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jul 27, 2018
Answer to Question 1

E

Answer to Question 2

Oxygen is highly reactive, and unless quickly replaced by photosynthesis, would soon disappear into surface rocks, as it has on Mars and Venus. However, life on Earth certainly evolved before it released the abundant present oxygen, and on other worlds, photosynthesis may not have evolved. Yet other forms of life may thrive using methane or hydrogen sulfide, all energy processes found here as well.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

luvbio

  • Hero Member
  • *****
  • Posts: 623
Reply #2 on: Jul 27, 2018
TY


lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

The skull of a wild boar found at Lan Lo Au, Hoi Ha Wan Marine Park, Hong Kong The skull of a wild boar found at Lan Lo Au, Hoi Ha Wan Marine Park, Hong Kong
Success Later in Life Success Later in Life
Life cycle of Plasmodium. Life cycle of Plasmodium.
Tornado Destruction - Loss of Life Tornado Destruction - Loss of Life
Clear the inguinal catchment area. Face the side of the table at recipient’s waist. Place your ... Clear the inguinal catchment area. Face the side of the table at recipient’s waist. Place your ...
WHAT IS THE AREA OF THE REGION SHADED IN RED? WHAT IS THE AREA OF THE REGION SHADED IN RED?
Video: Methods of carbon dioxide transport - carbaminohemoglobin and bicarbonate ions

For a complete list of videos, visit our video library