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

Author Question: How long ago did multicellular life forms appear in the fossil record? A) 4.5 billion years ago ... (Read 111 times)

yoroshambo

  • Hero Member
  • *****
  • Posts: 566
How long ago did multicellular life forms appear in the fossil record?
 
  A) 4.5 billion years ago
  B) 3.8 billion years ago
  C) one billion years ago
  D) 63 million years ago
  E) 30 million years ago

Question 2

Relate Herbig-Haro objects to the T-Tauri Wind.
 
  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

djpooyouma

  • Sr. Member
  • ****
  • Posts: 325
Answer to Question 1

C

Answer to Question 2

In stage 5, the spinning protostar forms a dusty disk, but ejects material at high speeds along the bi-polar jets perpendicular to this disk. The shock wave from these high speed jets lights up the Herbig-Haro objects along a line over a light-year long in some cases.





 

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

For a complete list of videos, visit our video library