TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: Early in the development of a human fetus, the skeleton is made entirely of what? Answer: cartilage

SOLUTION: Early in the development of a human fetus, the skeleton is made entirely of cartilage.

PROBLEM: Question: What has increased the greenhouse effect? Answer: human actions

SOLUTION: Human actions has increased the greenhouse effect.

PROBLEM: Question: Maintaining a high metabolic rate takes a lot of what? Answer: energy

SOLUTION:
Maintaining a high metabolic rate takes a lot of energy.