The work done is 137 joules.
Lifting opposes the acceleration of gravity, which is 9.8 m/sec/sec.
20 x 0.7 x 9.8 = 137 J (kg-m2/sec2)
The sporophyte produces
cones, an evergreen tree
•move
•maintain homeostasis
•require and use energy
•respond to stimuli
•reproduce
•grow and develop
•display organization
•made up of one or more cells
