Question

the traits which develops due to external environmental changes is 1. acquired traits 2. inherited traits 3. cross over 4. all of these ​

Answer 1

Traits which develop due to external environmental changes are acquired traits.

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Answer 2

The traits which develop due to external environmental changes are acquired traits. They are not inherited, but acquired due to changes in the external environment.

These are non-heritable changes in structure or function of an organism mainly caused due to environmental changes. These traits are not passed on to generations through reproduction.

So, the answer to your question would be the first option, acquired traits.