The increase of trade and transportation of animals or people.
Answer:
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Answer: make his own paper airplane.
Explanation:
At childhood age of about 3-years old to 5-year old a child learn to hop, swings, run,playing etc along with telling stories, speaking properly,increase vocabulary, speaking names and age etc.
According to the question, there might be doubt about Andrei able to make own paper airplanes because she is at her preschool childhood age where a child mostly not able to perform appropriately and detailed work on their own and requires guidance.
The correct answer is Systematic observation
Systematic observation is a method used to understand how a particular activity or task works. The researcher observes the steps of a process, the tools used, the difficulties that appear, the conversations and results of the work.
Systematic Observation is guided by a defined objective, something you want to know about that activity. The observation is made repeatedly until there is sufficient evidence to state this.
Systematic Observation can be used to do Behavioral Mapping, Task Analysis or Activity Analysis.
Oxygen is formed along with glucose during photosynthesis.