According to the law of conservation of matter, which statement about chemical reactions is true?
a. every atom destroyed in a chemical reaction must be replaced.
b. atoms are created by some reactions and destroyed by others.
c. energy is created as atoms are destroyed in chemical reactions.
d. atoms cannot be created or destroyed by chemical reactions.

- decrease the number of plants and animals living in the water.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".