This topic contains a solution. Click here to go to the answer

Author Question: How do scientists study the history of life on Earth? A) by comparing present-day organisms with ... (Read 92 times)

ishan

  • Hero Member
  • *****
  • Posts: 546
How do scientists study the history of life on Earth?
 
  A) by comparing present-day organisms with each other, and assuming past life had mixed traits of present-day organisms
  B) by assuming that life in the past was just like present-day life
  C) by using telescopes to look far away, and thus see what life was like in the past
  D) by studying fossils, the preserved remains of past organisms

Question 2

Explain how the resonance among Io, Europa, and Ganymede makes their orbits slightly elliptical.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

millet

  • Sr. Member
  • ****
  • Posts: 354
Answer to Question 1

D

Answer to Question 2

For every orbit that Ganymede completes around Jupiter, Europa completes exactly two orbits and Io completes exactly four. Therefore, all three planets line up for every orbit of Ganymede, and Io and Europa line up twice each Ganymede orbit. The gravitational tugs from their sister moons add up over time, and these tugs are always in the same direction. Therefore, the moons' orbits become slightly elliptical over time.




ishan

  • Member
  • Posts: 546
Reply 2 on: Jul 27, 2018
Gracias!


epscape

  • Member
  • Posts: 335
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Did you know?

The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

For a complete list of videos, visit our video library