From diffusion of nutrients from underlying layers
The nurse will determine that circulation to the feet remains sufficient by applying pressure to the toes. If color rapidly returns that means that circulation is adequate. This should be done with both feet and the responses should be compared for adequacy of circulation and symmetry.
A describes a gymnosperm.
B describes any type of plant.
C is too vague to even describe a plant.
D (the correct answer) describes an angiosperm (flowering plant). After double fertilization, angiosperms form a fruit over the ovulary of the plant, where the seeds are located.
C) Help with plant defense.
Many species are known to eat many plants, including flowers. To avoid being eaten, thorns in a rose bush help defend itself.