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

Author Question: The most important event during the Cambrian period was the A) emergence of the fishes. B) ... (Read 36 times)

Davideckstein7

  • Hero Member
  • *****
  • Posts: 555
on: Jul 29, 2018
The most important event during the Cambrian period was the
 
  A) emergence of the fishes.
  B) ability of organisms to form an outer skeleton.
  C) emergence of the trilobite.
  D) ability of organisms to develop lungs.

Question 2

What spectacular development in organisms marks the beginning of the Paleozoic era?
 
  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

rosiehomeworddo

  • Sr. Member
  • ****
  • Posts: 306
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: B

Answer to Question 2

Answer: Organisms developed ability to secrete calcium-carbonate and calcium-phosphate for the formation of hard shells and skeletons. Hard shells provided protection from predators and UV radiation, and made organisms better able to be preserved as fossils.


Davideckstein7

  • Member
  • Posts: 555
Reply 2 on: Jul 29, 2018
:D TYSM

jordangronback

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

The terrorist attack of September 11, 2001, is surely a defining event for the cohorts who experienc The terrorist attack of September 11, 2001, is surely a defining event for the cohorts who experienc
Embryonic Period Embryonic Period
Embryonic Period Embryonic Period
Embryonic Period Embryonic Period
Embryonic Period - 4th week Embryonic Period - 4th week
ATP, an important energy currency in cells ATP, an important energy currency in cells
Video: The primary factors that affect circulation - MABP, CO and SVR

For a complete list of videos, visit our video library