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 103 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
Great answer, keep it coming :)

irishcancer18

  • Member
  • Posts: 310
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

A double bond between two oxygen atoms A double bond between two oxygen atoms
Dialysis machine showing diffusion of concentrations, which are the same, between the patient’s ... Dialysis machine showing diffusion of concentrations, which are the same, between the patient’s ...
(a) A photograph of a radial immunodiffusion reaction for measurement of patient IgA concentrations. ... (a) A photograph of a radial immunodiffusion reaction for measurement of patient IgA concentrations. ...
Oxygen-binding curve for myoglobin Oxygen-binding curve for myoglobin
Percent of oxygen in the atmosphere versus altitude. Percent of oxygen in the atmosphere versus altitude.
The minimum number of moles of oxygen needed to completely consume 4 moles of C3H8O is ... The minimum number of moles of oxygen needed to completely consume 4 moles of C3H8O is ...
Video: The pH scale - Strong acids and Weak acids

For a complete list of videos, visit our video library