« previous next »

Author Question: Mass extinctions at the end of the Ordovician occurred because of: a. dramatic changes in oceans ... (Read 95 times)

rosent76

  • Hero Member
  • *****
  • Posts: 516
on: Jul 15, 2018

Mass extinctions at the end of the Ordovician occurred because of:
  a. dramatic changes in oceans related to glaciation.
  b. dramatic chemical changes in seawater related to meteorite impact.
  c. increased solar radiation.
  d. decreased solar radiation.
  e. dramatic changes in oceans related to glaciation AND increased solar radiation.



Question 2

The Precambrian-Cambrian boundary represents the first appearance of:
  a. vertebrates.
  b. amphibians.
  c. reptiles.
  d. animals with skeletons.
  e. animals with soft bodies.



dellikani2015

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 15, 2018
Answer to Question 1

Av

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

People about to have surgery must tell their health care providers about all supplements they take.

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.

Mass Loss from a Supermassive Star Mass Loss from a Supermassive Star
Mass Exchange Between Close Binary Stars Mass Exchange Between Close Binary Stars
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Polar ice caps lose mass as surface ice melts Polar ice caps lose mass as surface ice melts
Lab: Mass Relationships in Chemical Reaction Lab: Mass Relationships in Chemical Reaction
The mole fraction of oxygen in dry air near sea level is 0.20948, where the molar mass of ... The mole fraction of oxygen in dry air near sea level is 0.20948, where the molar mass of ...
Video: Calvin Cycle Explained!

For a complete list of videos, visit our video library