Ask a Question
  
  
  
Top Posters
Since Sunday
7
7
6
6
6
5
5
5
5
5
5
5
New Topic  
wrote...
Posts: 1
Rep: 0 0
A week ago
The average levels of lead in the blood of children have declined by 90%.
      
Acid deposition has increased by 27%.
      
Total emissions of five principal air pollutants have increased by 14%.
      
The release of toxic chemicals has increased by 19%.
Read 26 times
1 Reply
Related Topics
Replies
wrote...
Educator
A week ago
https://biology-forums.com/index.php?topic=1887786.0
The best way to say thank you is with a positive review:

  https://trustpilot.com/review/biology-forums.com 

Your support goes a long way!


Make a note request here
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers.
Learn More
Improve Grades
Help Others
Save Time
Accessible 24/7
  152 People Browsing
 196 Signed Up Today
Related Images
 793
 148
 48
Your Opinion
What percentage of nature vs. nurture dictates human intelligence?
Votes: 61

Previous poll results: What's your favorite coffee beverage?