Aplant can have either broad leaves (b) or narrow leaves (b) a plant with genotype bb is crosses with a plant with genotype bb which punnet square correctly represents this cross

The correct answer is shown in the figure attached below.

The genotype of one parent is Bb. Thus, it would produce two types of gametes.  

One type of gamete will contain B and another type of gamete will contain b.

The genotype of another parent is bb. Thus, it will produce only one type of gamete which will contain b.

The cross would result in the production of offspring with two types of genotypes in equal proportions. The two genotypes would be Bb and bb.

The phenotypic ratio would be 1 (broad leaves): 1 (narrow leaves).

for the points

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.