Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Amphibians have permeable skin that easily absorbs substances from the environment. This may explain why they seem to be especially sensitive to pollution. Monitoring the health and survival of amphibians may help people detect pollution early, before other organisms are affected. Answer: amphibians

Ex Output:
What group of animals has permeable skin that makes them vulnerable to pollution?

Ex Input:
Passage: tobacco smoke causes fatal lung disease in nonsmokers. Answer: tobacco smoke

Ex Output:
What still causes fatal lung disease in nonsmokers?

Ex Input:
Passage: When gametes unite during fertilization, the resulting zygote inherits two alleles for each gene. One allele comes from each parent. The alleles an individual inherits make up the individual's genotype . The two alleles may be the same or different. As shown in Table below , an organism with two alleles of the same type ( BB or bb ) is called a homozygote . An organism with two different alleles ( Bb ) is called a heterozygote . This results in three possible genotypes. Answer: alleles

Ex Output:
When gametes unite during fertilization, the resulting zygote inherits two of what for each gene, one from each parent?