Which of the following statements about mutations are true? Select all that apply. Select one or more: a. Indel mutations that occurred in an exon (translated part of the gene) can be silent. b. A substitution mutation can lead to a frameshift. c. Mutations are the only source for the origin of new alleles. d. Both substitution and indel mutations could result in a non-sense mutation in the affected codon following the mutational event.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

d. organisms have cells with different shapes and functions.

d. cellulose and starch