Cigarette smoke contains thousands of chemicals, 50 of which are known

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Approximately what wavelength of light is best absorbed by chlorophyll a

Cloning an individual usually produces orangisms that (1) contain dangerous mutations (2) contain identical genes (3) are identical in appearance and behavior (4) produce enzymes different from the parent