What are the two main ways of heating commercial greenhouses? ...

[penza]

What are the two main ways of heating commercial greenhouses?
 
  What will be an ideal response?

Question 2

Explain how you would check an arrangement for line, visual balance, and unity.
 
  What will be an ideal response?

[phuda]

Answer to Question 1

Gas and oil

Answer to Question 2

Check that the longest of the flowers are establishing the direction (line) of the arrangement. Then see if the smaller flowers are higher in the arrangement and the larger ones below them to make sure the arrangement is not top heavy and has balance. Lastly, make sure that the design has unity by not having flowers of the same type bunched together and that the flowers of the same type are in odd numbers, not in pairs or even numbers.

[penza]

Gracias!

[mammy1697]

Excellent