« previous next »

Author Question: What characterized the Ordovician in terms of invertebrate life, and how does that relate to what ... (Read 24 times)

asan beg

  • Hero Member
  • *****
  • Posts: 570
on: Jul 15, 2018

What characterized the Ordovician in terms of invertebrate life, and how does that relate to what was
  happening geologically? What will be an ideal response?



Question 2

What is the Cambrian explosion? Is their appearance sudden? Why is it sudden, or why does it seem
  so? What will be an ideal response?



Anton

  • Sr. Member
  • ****
  • Posts: 302
Reply #1 on: Jul 15, 2018
Answer to Question 1

A major transgression in the Middle Ordovician brought to the continent a vast, shallow sea with a
warm climate, so shelly fauna increased in diversity and number. Extensive glaciation in Gondwana at
the end of the period caused a regression and a mass extinction of more than 100 families of marine
invertebrates.



Answer to Question 2

The Cambrian explosion refers to the sudden appearance of new animals in the fossil record, animals
with skeletons. So many fossils appear rapidly because of the development of skeletons, which
fossilize much better. Also, these advances helped life to proliferate.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

The life cycle of the early diverging moss genus, Sphagnum, illustrating reproductive adaptations th The life cycle of the early diverging moss genus, Sphagnum, illustrating reproductive adaptations th
In The Gross Clinic (1875), by Thomas Eakins, Professor Samuel Gross’s team of surgeons cuts through In The Gross Clinic (1875), by Thomas Eakins, Professor Samuel Gross’s team of surgeons cuts through
The gender roles that we learn during childhood become part of our basic orientations to life. ... The gender roles that we learn during childhood become part of our basic orientations to life. ...
Multiple sclerosis is characterized by damage to the myelin sheath surrounding the axons of motor ... Multiple sclerosis is characterized by damage to the myelin sheath surrounding the axons of motor ...
RNA polymerase subunit structures in the three domains of life RNA polymerase subunit structures in the three domains of life
Directional Terms Directional Terms
Video: T cell receptors

For a complete list of videos, visit our video library