I think the answer is lizards
The "mechanism" is that the chromatids are being separated to show that they are being divided to later be divided in telophase
Age cohort is the group of people born during the same time. Due to their similar time of birth, they pass the course of life together. Therefore, the correct answer to your question is A. Example of the age cohort is the students of particular class, who are of same age group ad have similar expressions and concerns.