Those resources that can, with proper care and attention in the future, be replaced. (Wood, paper, cardboard)

(a)  

How can humans take positive actions to reverse the degradation of the natural environment caused by human technology?

Toxic substances get concentrated as they move up the food chain, so the higher levels are most affected.

(a)  

As a student, how can you help in the proper disposal of garbage?

How does planting of trees prevent greenhouse effect?

What is the purpose of the male reproductive system?

What hormone causes the development of male secondary sex characteristics?

(a)  

What is the purpose of the female reproductive system?

Which female reproductive organs produce ova and estrogen?

(a)  

How has human technology and the growth of the human population affected the quality of life for other speices?