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Assertion :- The rate of appearance of new forms is liked to the life cycle or the life span of organisms. Reason :- The organism with short life span have ability to produce more progenies in shorter time and that have chance to more expsure with nature.

Suppose a teacher has short height. It creates an obstacle in utilizing the blackboard in a justifiable manner. Therefore, the students cannot follow the lessons in spite of utmost care taken by the teacher. In such a condition what would you like to suggest her?

Assertion : Cockroach shows sexual dimorphism Reason : The female cockroach bears a pair of short thread like anal styles.