I need help on the second one

Which situation would most likely result in evolution? question 2 options: an alligator has no alleles for scales. a large population loses a few individuals. a single individual joins a large population. a predator prefers one phenotype to another.

Cholera is a bacterial infection of the small intestine. vaccination provides protection against cholera. the cholera vaccine is made up of weakend form of the bacteria that causes cholera. the vaccine will stimulate blank production and elicit an immune response. if the infection occurs again, the bodynwill produce an even greater attack on thre bacteria because of blank.

Can anybody me with this? a single egg is a(n): it's not ovary. ovary ova ovum yolk