3 & usually 1-2 hours , hope this helps some !
The study enables scientists to understand the importance of the roles that genes and environment play in intelligence.
<h3>What is inteligience study?</h3>
The term intelligience study has to do with the asessment of individuals to effectively complete a given task in short period of time.
Twins share the same environment hence, scientists can be able to decode the importance of the roles that genes and environment play in intelligence.
Learn more about intelligence:brainly.com/question/9944825
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C is correct because it’s documented
Answer:
Ignition sources
Explanation:
Lightning
Smoking
Electrical and mechanical sparks
