For movement, respiration and to control the heartbeat
Giraffes obtain their energy by eating the leaves of acacia trees.
No.
Giraffes use energy by walking around. They also use energy when they eat by using their long tongues to grab leaves off of the tall trees.
No. Giraffes require farily sparsely scattered tall trees, and hippos require rivers. They do share some common ground, but just at the edges of their normal habitats.
giraffes depend on their mechanical neck which is why they have long necks which tells them if bad leaves is good for them
Giraffes eat the twigs off of trees. They also consume shrubs, grass and fruit.
They undergo cellular respiration.
The pluralization of Giraffe does not require an apostraphy. But, in answer to your question, penis.yes
no it does not require energy.
endothermic reactions require energy
thinking, dreaming require energy
All living organisms (not dead) require energy