In a people/plant interaction, a person cares for a plant, ...

[penguins]

In a people/plant interaction, a person cares for a plant, provides it with water, sunlight, and ____; and
  the plant provides beauty as long as it remains healthy.

 
 

a. the appropriate temperature c. other plants
  b. human interaction d. plant food

Question 2

Ornamental plant materials have the principles of ____ built-in, providing a set of reasons why they
  are so beautiful.

 
 

a. petioles c. care
  b. roots d. design

[abctaiwan]

Answer to Question 1

A

Answer to Question 2

D