Humans often selectively breed plants to create better, more nutritious crops. plants are not as difficult to selectively breed as animals because most plants have
a. very simple genetic codes.
b .a natural resistance to disease.
c. only male or female reproductive parts.
d. both male and female reproductive parts.

d. both male and female reproductive parts.

Selective breeding is a process in which parents of plants and animals species are chosen by humans and they are bred t obtain desirable traits in organisms useful for human. Plants have both male and female reproductive parts so they can undergo self pollination and cross pollination in order to obtain desirable traits. Self pollinating property can also be utilize to produce plants that are genetically identical and exhibiting desirable genetic traits.

the index of refraction of the second medium is higher. i just took the test trust me !