Tobacco has been linked to many health problems. what is the most complete list of forms of tobacco that cause cancer? a. cigarettes and snuff
b. chewing tobacco and snuff
c. cigarettes and chewing tobacco
d. cigarettes, chewing tobacco, and snuff

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

Predict the results of a two base insertion or deletion in a strand of dna that codes for a protien, how does this differ from a three base insertion or deletion?