Alice has type A blood and her husband Mark has Type B blood

From this information, we know both parents are heterozygous. This means each parent has an O allele to produce a child with type O blood. A and B blood type alleles are dominant to the O allele which allows one to be heterozygous and express A and B blood type but still have an O allele. This makes that Alice's blood type would be AO. Additionally, the father genotype would have to be BO.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms