. When a couple are both carriers of a recessive allele for a genetic disease, what will be the probability that they will have a child with the disease?
a) 0%
b) 20%
c) 25%
d) 100%

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds