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

Author Question: The most productive systems on land are A) natural prairies. B) grasslands. C) forests. D) ... (Read 8 times)

jace

  • Hero Member
  • *****
  • Posts: 541
on: Jul 16, 2018
The most productive systems on land are
 
  A) natural prairies.
  B) grasslands.
  C) forests.
  D) tundra.

Question 2

In 1948 in Donora, Pennsylvania, the routine release of toxins into the air became a deadly fog because of
 
  A) a chemical spill in the nearby Monongahela River.
  B) greatly increased activity of the nearby industries.
  C) a thermal inversion and stagnant weather conditions.
  D) the failure of the chemical scrubbing systems on smokestacks.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

macagn

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 16, 2018
Answer to Question 1

C

Answer to Question 2

C


jace

  • Member
  • Posts: 541
Reply 2 on: Jul 16, 2018
:D TYSM

helenmarkerine

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Natural selection of a population for dark coloration. Natural selection of a population for dark coloration.
Selected Natural Products Selected Natural Products
Geothermal energy and powers Earth’s systems Geothermal energy and powers Earth’s systems
Agricultural Land as a Fraction of Total Wealth in the United Kingdom Agricultural Land as a Fraction of Total Wealth in the United Kingdom
Coniferous forests Coniferous forests
Video: Molecules, Membrane Permeability and Structure

For a complete list of videos, visit our video library