The "Rr" is heteroyzgous red
The "RR" is homozygous dominant
The "rr" is homozygous recissevie
If you didn't forgot to put the letters in caps this is the explanation:
100% of the possible gametes will contain the a alelle.
possible combination of gametes all result in the same: ab or ab
Just to compare if the genotype was Aabb
The gametes would be : Ab or ab
1. They play dead when faced by a predator.
2. They travel in schools of about 12.
3. Males establish their dominance by having sword fights with their spines and showing off their bright colors.
I would go with c because its tells you right in there that the ecosystem help who lives around that area.