This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why do we believe the Cambrian explosion occurred so suddenly? A) oxygen concentrations reached ... (Read 141 times)

altibaby

  • Hero Member
  • *****
  • Posts: 562
on: Jul 27, 2018
Why do we believe the Cambrian explosion occurred so suddenly?
 
  A) oxygen concentrations reached critical levels necessary to support more complex life
  B) organisms became sufficiently complex that more diversity became possible
  C) climate change due the end of the last snowball Earth phase
  D) all of these

Question 2

In the outer regions of the solar nebula where temperatures were low,
 
  A) only rock and iron could condense
  B) only hydrogen compounds could condense as ices
  C) hydrogen and helium gases were able to condense
  D) in addition to rock and iron, hydrogen compounds also condensed as ices


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

recede

  • Sr. Member
  • ****
  • Posts: 315
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


altibaby

  • Member
  • Posts: 562
Reply 2 on: Jul 27, 2018
Gracias!

pangili4

  • Member
  • Posts: 346
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Did you know?

The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

The Phanerozoic Oxygen Isotope Record of Seawater The Phanerozoic Oxygen Isotope Record of Seawater
How Much Is Enough? The Explosion In The Number of U.S. Prisoners How Much Is Enough? The Explosion In The Number of U.S. Prisoners
Connecting a handheld digital storage oscilloscope to an oxygen sensor signal wire. The use of the ... Connecting a handheld digital storage oscilloscope to an oxygen sensor signal wire. The use of the ...
Polio eradication campaign in Georgia in the 1950s. In the 1950s, 20,000 cases of polio occurred ... Polio eradication campaign in Georgia in the 1950s. In the 1950s, 20,000 cases of polio occurred ...
Metals reacting with oxidized oxygen Metals reacting with oxidized oxygen
Carbon Dioxide Concentrations for 400,000 years Carbon Dioxide Concentrations for 400,000 years
Video: Double Vacuum Process (Illustration No Audio)

For a complete list of videos, visit our video library