Notice: Payments for answers will end 4/10/2017. Click for more info.
You have new items in your feed. Click to view.
Question and answer
Q: Which of the following events define the Proterozoic eon? eukaryotic cells first seen stable continents first bacterial fossils Cambrian explosion oxygen builds up in atmosphere
A: explosion oxygen builds up in atmosphere/The later of the two divisions of the Precambrian Eon, from about 2.5 billion to 540 million years ago. [ The Proterozoic was characterized by the formation of stable continents, the appearance of abundant bacteria and archaea, and the buildup of oxygen in the atmosphere. By about 1.8 billion years ago the oxygen buildup was significant enough to cause
many types of bacteria to die out. At this time eukaryotes, including multicellular algae and the first animals, first appear in the fossil record. (Earth Sciences / Geological Science) the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have lived Compare Archaeozoic adj (Earth Sciences / Geological Science) of or formed in the late Precambrian era ]
Controler|Points 3928|
Question
Asked 8/27/2013 9:20:38 AM
0 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
26,489,211 questions answered
Popular Conversations
The following two sentences are saying the same thing. Emily, my ...
Weegy: The following two sentences are saying the same thing. Emily, my daughter, is in sixth grade. Emily, my daughter ...
11/13/2017 12:26:02 PM| 3 Answers
Solve for x in the equation 6x = 42.
Weegy: 6x = 42
11/8/2017 11:42:29 AM| 2 Answers
4y + 228 = 352.
Weegy: 4y + 228 = 352
11/8/2017 11:59:04 AM| 2 Answers
Coefficient of 2xy^3
11/8/2017 12:00:24 PM| 2 Answers
3.85 x 10^-3
Weegy: (3.85 x 10) - 3 User: Give the number of significant figures in this number: 40.00 Weegy: number of ...
11/15/2017 9:18:26 AM| 2 Answers
Weegy Stuff
S
L
P
Points 166 [Total 291] Ratings 9 Comments 76 Invitations 0 Offline
S
P
L
P
Points 21 [Total 151] Ratings 0 Comments 21 Invitations 0 Offline
S
P
P
L
P
P
Points 20 [Total 1658] Ratings 0 Comments 20 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 1] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)
Home | Contact | Blog | About | Terms | Privacy | © Purple Inc.