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

Author Question: Which of the following human activities contributed to the pollution of our ancestral air? A) ... (Read 78 times)

kamilo84

  • Sr. Member
  • ****
  • Posts: 495
on: Aug 27, 2018
Which of the following human activities contributed to the pollution of our ancestral air?
 
  A) Discovering, making, and using tools contributed to air pollution.
  B) The discovery and use of fire contributed to air pollution.
  C) The development of crop farming contributed to air pollution.
  D) All of these contributed to air pollution.

Question 2

Petroleum jelly is
 
  A) a mixture of low carbon number hydrocarbons.
  B) a mixture of moderate carbon number hydrocarbons.
  C) a mixture of higher carbon number hydrocarbons.
  D) none of the above


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

perkiness

  • Sr. Member
  • ****
  • Posts: 348
Reply #1 on: Aug 27, 2018
Answer to Question 1

D

Answer to Question 2

C


kamilo84

  • Member
  • Posts: 495
Reply 2 on: Aug 27, 2018
:D TYSM

peter

  • Member
  • Posts: 330
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

The human embryo The human embryo
The major muscles of the human body, anterior side. The major muscles of the human body, anterior side.
The Oase I mandible, earliest modern human in Europe. The Oase I mandible, earliest modern human in Europe.
Human immunodeficiency virus (HIV) micrograph Human immunodeficiency virus (HIV) micrograph
Human Viruses Associated with Cancers Virus Human Viruses Associated with Cancers Virus
Humulin, a recombinant form of human insulin Humulin, a recombinant form of human insulin
Video: Enzyme structure - Properties of enzymes

For a complete list of videos, visit our video library