Author Question: The greatest progress in reducing atmospheric levels of lead pollution resulted from A) the ... (Read 37 times)

nevelica

  • Hero Member
  • *****
  • Posts: 563
The greatest progress in reducing atmospheric levels of lead pollution resulted from
 
  A) the elimination of leaded gas.
  B) the switch from lead to graphite in pencils.
  C) the development of new types of batteries that use lithium instead of lead.
  D) new types of lead scrubbers on smokestacks that removed lead from the air.

Question 2

Increases in ocean temperatures often result in coral bleaching, in which
 
  A) the symbiotic relationship between corals and their algae is disrupted.
  B) the calcium carbonate of corals is dissolved away, leaving only the soft animals behind.
  C) the water becomes so cloudy that no light can reach the symbiotic algae in corals.
  D) high levels of chlorine are released from the corals, killing the fish that swim by.



mcomstock09

  • Sr. Member
  • ****
  • Posts: 377
Answer to Question 1

A

Answer to Question 2

A



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

For a complete list of videos, visit our video library