A hybrid is the offspring of a cross between two different
kinds of plants or animals. Different species, stocks, races, or
breeds can be 46 a hybrid. The mule is a good example of a
hybrid 47 . It is the result of a mating between a jackass (male
donkey) and a mare (female horse).
Plant and animal hybrids sometimes occur in nature. They
48 . The creation of hybrids 49 to the growers of plants.
There are several reasons for creating hybrid plants. Hybrids
50 than either of their parents. The best hybrids produce more
grain or fruit than their parents. They are also hardier 51 disease.
Through hybridization, plant growers can create 52 . In a
sense, they can improve on nature. Plant growers can take a kind of
tree 53 tasty fruit but suffers from cold weather and cross it with
a tree that has poor fruit but doesn’t suffer from the cold. 54 that
has good fruit and can tolerate cold weather.