I’m not an expert but I’d say B
It is an example of migration. Hope this helps!
Karyotyping is used to:
study chromosomes.
treat Down syndrome.
repair chromosomes.
diagnose genetic diseases.
Answer:
primary succession takes longer
Explanation:
Primary succession is built from the ground up, whereas secondary succession is built from an already existing civilization.
31c-11c=20c So, therefore, the range is 20c.
Hope this helps! :D