Pbcl2 pb + cl2 does the chemical reaction shown above obey the law of conservation of mass? a. yes, because the moles of cl2 and pb are equal. b. yes, because the equation is balanced. c. no, because a new molecule is produced. d. no, because one particle breaks into two particles.

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

Which of th following is needed for cellular respiration to occur

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?