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 133 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
Wow, this really help

cpetit11

  • Member
  • Posts: 321
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Effect of pH on oxygen binding to hemoglobin Effect of pH on oxygen binding to hemoglobin
Effect of BPG on oxygen binding to hemoglobin. The BPG concentration Effect of BPG on oxygen binding to hemoglobin. The BPG concentration
Myocardial Oxygen supply and demand Myocardial Oxygen supply and demand
The Last 10,000 Years of Greenhouse Gas Concentrations The Last 10,000 Years of Greenhouse Gas Concentrations
The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom. The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom.
Oxygen Transport: Hemoglobin Oxygen Transport: Hemoglobin
Video: Brain Lobes Animation

For a complete list of videos, visit our video library