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QUESTION: THINK CRITICALLY: Some conifers have female cones on the top half of the tree and male cones on the bottom half. Why would this arrangement of cones on a tree be important?

The male cones appear on the trees in the spring time.  The male cones are smaller than the female cones that we typically think of when we think of pine cones.  These cones are softer and are only on the trees in the spring.  After they release their pollen they die away and disappear.

Explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.