« previous next »

Author Question: What characterized the Ordovician in terms of invertebrate life, and how does that relate to what ... (Read 22 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?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Relationships among major invertebrate lineages Relationships among major invertebrate lineages
Grime's classification of plant life-history strategies Grime's classification of plant life-history strategies
Life of a Medical School Student Life of a Medical School Student
Urinary tract infection. A UTI is characterized by fever, lumbar or abdominal pain, and pain or burn Urinary tract infection. A UTI is characterized by fever, lumbar or abdominal pain, and pain or burn
How to evaluate algebraic terms containing fractional exponents without a calculator (Part 2) How to evaluate algebraic terms containing fractional exponents without a calculator (Part 2)
The impact of industry and manufacturing on our life The impact of industry and manufacturing on our life
Video: Introduction to Photolithography - WC, BLF, PA, Hard and Soft baking

For a complete list of videos, visit our video library